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April 10, 2026
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"S. S. Chern revolutionized differential geometry with the use of moving frames, the invention of characteristic classes, the modern concept of a connection and so much more, but he’ll probably always be most remembered for the yellowing University of Chicago mimeographed lecture notes from the 1950s. An entire generation of geometers learned the elements of differentiable manifolds from those notes."
"The main object of study in differential geometry is, at least for the moment, the differential manifolds, structures on the manifolds (Riemannian, complex, or other), and their admissible mappings. On a manifold the coordinates are valid only locally and do not have a geometric meaning themselves."
"Not all the geometrical structures are "equal". It would seem that the riemannian and complex structures, with their contacts with other fields of mathematics and with their richness in results, should occupy a central position in differential geometry. A unifying idea is the notion of a G-structure, which is the modern version of an equivalence problem first emphasized and exploited in its various special cases by Elie Cartan."
"The treatises of Darboux (1842–1917) and Bianchi (1856–1928) on surface theory are among the great works in the mathematical literature. They are: G. Darboux, Théorie générale des surfaces, Tome 1 (1887), 2 (1888), 3 (1894), 4 (1896), and later editions and reprints. L. Bianchi. Lezioni di Geometria Differenziale, Pisa 1894; German translation by Lukat, Lehrbuch der Differentialgeometrie, 1899. The subject is basically local surface theory."
"It is well known that in three-dimensional elliptic or spherical geometry the so-called Clifford's parallelism or parataxy has many interesting properties. A group-theoretical reason for the most important of these properties is the fact that the universal covering group of the proper orthogonal group in four variables is the direct product of the universal covering groups of two proper orthogonal groups in three variables. This last-mentioned property has no analogue for orthogonal groups in n (>4) variables. On the other hand, a knowledge of three-dimensional elliptic or spherical geometry is useful for the study of orientable Riemannian manifols of four dimensions, because their tangent spaces possess a geometry of this kind."
"In 1917 Levi-Civita discovered his celebrated parallelism which is an infinitesimal transportation of tangent vectors preserving the scalar product and is the first example of a connection. The salient fact about the Levi-Civita parallelism is the result that it is the parallelism, and not the Riemannian metric, which accounts for most of the properties concerning curvature."
"Recently, having refreshed my understanding of the mathematics of relativity theory, I called one of my old Berkeley professors to ask him some questions about the geometry of general relativity. S. S. Chern is arguably the greatest living geometer. We spoke on the phone for a long time, and he patiently answered all my questions. When I told him I was contemplating writing a book about relativity, cosmology, and geometry and how they interconnect to explain the universe, he said, "It's a wonderful idea for a book, but writing it will surely take too many years of your life ... I wouldn't do it." Then he hung up."
"Integral geometry, started by the English geometer M. W. Crofton, has received recently important developments through the works of W. Blaschke, L. A. Santaló, and others. Generally speaking, its principal aim is to study the relations between the measures which can be attached to a given variety."
"I have no doubt that future historians of differential geometry will rank Chern as the worthly successor of Elie Cartan in that field."
"Even the blandest (or bluffest) “scholarly work” fears getting into trouble: less with the adversaries whose particular attacks it keeps busy anticipating than through what, but for the spectacle of this very activity, might be perceived as an overall lack of authorization. It is as though, unless the work at once assumed its most densely professional form, it would somehow get unplugged from whatever power station (the academy, the specialization) enables it to speak. Nothing expresses—or allays—this separation anxiety better than the protocol requiring an introduction to “situate” the work within its institutional and discursive matrix. The same nervous ritual that attests a positive dread of being asocial — of failing to furnish the proper authorities with one’s papers, and vice versa — places these possibilities at an infinite remove from a writing whose thorough assimilation, courted from the start, makes it too readable to need to be read much further."
"One seeking to understand the recurrent ebb and flow of economic activity characteristic of the present day finds these numerous explanations both suggestive and perplexing. All are plausible, but which is valid? None necessarily excludes all the others, but which is the most important? Each may account for certain phenomena ; does any one account for all the phenomena ? Or can these rival explanations be combined in such a fashion as to make a consistent theory which is wholly adequate?"
"In physical science and in industrial technique... we have emancipated ourselves... from the savage dependence upon catastrophes for progress... In science and in industry we are radicals—radicals relying on a tested method. But in matters of social organization we retain a large part of the conservatism characteristic of the savage mind..."
"I began studying philosophy and economics about the same time. The similarity of the two disciplines struck me at once. I found no difficulty in grasping the differences between the great philosophical systems as they were presented by our textbooks and our teachers. Economic theory was easier still. Indeed, I thought the successive systems of economics were rather crude affairs compared with the subtleties of the metaphysicians. Having run the gamut from Plato to T. H. Green (as undergraduates do) I felt the gamut from Quesnay to Marshall was a minor theme. The technical part of the theory was easy. Give me premises and I could spin speculations by the yard. Also I knew that my 'deductions' were futile..."
"This book offers an analytic description of the complicated processes by which seasons of business prosperity, crisis, depression, and revival come about in the modern world. The materials used consist chiefly of market reports and statistics concerning the business cycles which have run their course since 1890 in the United States, England, Germany and France."
"THE MOST ELEMENTARY ASPECT of administration is organization the structure of social institutions and their constituent parts, the composition of economic enterprises and their various branches, the organization of governmental agencies and their numerous departments. As it is mainly a matter of structure, organization bears the same rudimentary relationship to administration as does the science of anatomy or skeletology to the field of medicine. An administrative organization can be sketched and charted just as the human body can be physically depicted. Apart from its graphic convenience and its "teachable" quality, however, what intrinsic relationship does organization bear to administration?"
"Admitting that business and government are both bureaucratic giants, most authorities take the view that an intrinsic difference separates them. This position was expressed effectively by: (a) Professor Wallace Donham, Dean of the Graduate School of Business Administration at Harvard University; (b) Sir Josiah Stamp, an English businessman and public servant; and (c) Professor Nathan Isaacs, also of Harvard University."
"MANAGEMENT involves the concrete practices and the observable techniques of administration. Frequently the term management is used synonymously with administration, and it is invariably assumed that a good manager is a good organizer. All of these usages are justified in the general terminology of administration, but in its more specialized sense management refers to the following specific techniques:"
"Brooks Adams advocated that the chief function of administration should be to facilitate social change, or paradoxical as it may seem, to assure social stability by facilitating social change. Great-grandson of President John Adams, grandson of President Quincy Adams, brother of the "educated" Henry Adams, Brooks Adams produced, during the early 1900'S, a series of unorthodox historical essays. Their titles were more radical than their contents: The Law of Civilization and Decay, "The Collapse of Capitalistic Government," and The Theory of Social Revolutions. The last of these is quoted below; the first was regarded by Theodore Roosevelt as a "melancholy" but "powerful" book with "a very ugly element of truth.""
"One motive for Henri Fayol's vigorous defense of administration as a subject for serious scientific study was the fact that he saw France, in the period between the and World War I, disintegrating for lack of administrative ability and managerial efficiency. Hoping to make sounder administrative practices available to French civil and military agencies, he fostered the "Center of Studies in Administration" in Paris, as a kind of French Public Administration Clearing House. Fayol was one of the principal consultants to the French government during the crisis period of World War I and a leading participant in the International Congress of Administrative Sciences. Despite his conservative views about French politics, he was in complete agreement on questions of governmental organization with the rising French socialist of those days, Leon Blum, who, as Prime Minister, was later to try out some of the administrative ideas they both held in common. This is... but one of several such instances of agreement on administrative matters among political opposites, an instance which helps to establish the view Fayol insisted upon, namely, that administration is a subject of universal importance."
"Charles E. Merriam... attributed a decisive position to the managers of a democratic society. As Chairman of the Department of Political Science at the University of Chicago between the two World Wars, Professor Merriam inspired a generation of students and practitioners of public administration. As a local political leader in Chicago and as a national adviser to liberal American Presidents from Theodore Roosevelt to Franklin Roosevelt, Merriam recognized the practical significance of public management. In his overall treatise on Systematic Politics, Merriam devoted the final but perhaps the most significant section of his chapter on "The Organs of Government" to what he calls "the managerial organ.""
"Many scholars who studied at the in the 1930s knew him well, due to his role in the intellectual ferment within political science and the other social sciences at Chicago during these years. At the age of 23 he was already a Ph.D. and a research collaborator with . By the age of 27, he had published three books with the University of Chicago Press: Judicial Systems of Metropolitan Chicago (1932); Movement of the Metropolitan Region of Chicago (1933), (co-authored with Charles E. Merriam and Spencer Parratt); and Home Rule for Metropolitan Chicago (1935). Among the best of his publications was a report of the in 1939, which helped to launch modern research on local government as a component in tri-level federal system that is the foundation for intergovernmental relations in the United States. During these years, he was an active participant in the New Deal, and the ideals of the New Deal remained a cornerstone of his approach to government and politics."
"Administration is sometimes referred to by specialized words such as management or organization, by particular terms such as executive work, or by general concepts such as public administration. Regardless of the name or nature of this supposedly new science, it is an art and technique which reaches far back into the experience of civilized man. For this reason, we include in this book ideas about administration presented by many authorities ranging from Aristotle and Socrates to Wilson and Stalin. Also included are the contributions of some three hundred other writers less renowned but no less convincing as to the importance of administration and its related subjects of management and organization."
"Administration, like other fields of knowledge, may be defined in various ways, but there is wide agreement on the following aspects of the subject:"
"Business-cycle theorists concerned themselves with why the economy naturally generated fluctuations in employment and output, [while the rest of the profession] continued to operate on the assumption that full employment was the natural, equilibrium position for the economy."
"Robert Aaron Gordon [was] an economist and an international authority on business cycles and manpower policy... Dr. Gordon, a professor emeritus at the University of California at Berkeley, had been consultant to the President's Council of Economic Advisers under Presidents Eisenhower, Kennedy and Johnson. In 1975, he served as the president of the American Economic Association. Dr. Gordon, who was a strong critic of the current computer techniques used on economics, helped to design today's unemployment statistics when he was the bead of a Presidential commission that bore his Warne in the early 1960's."
"Already before World War II he had turned his attention to what would become a life-long preoccupation; business cycle theory and policy, with special emphasis on man-power problems and unemployment. His books on The Dynamics of Economic Activity (1947) and Business Fluctuations (1952) were for many years standard reading at American universities, and it was an obvious choice when in the early sixties the American Economic Association asked him to co-edit (with Lawrence Klein) its second volume on Readings in Business Cycles (1965), his most outstanding contributions in this field. His last book in this field was Economic Growth and Instability (1974). His primary interest, however, was in the more narrow field of unemployment, which he saw as his country's most serious."
"The real revolution (in property rights) has already largely taken place; the great majority of stockholders have been deprived of control of their property through the diffusion of ownership and the growth in the power of management."
"The more active working directors become, the more closely involved they resemble the executives now responsible for providing business leadership. A full-time working director is merely another official who is also a director. Wide adoption of the proposal for professional directors, particularly if management is able to select the directors itself, may merely make general the situation now found in some companies in which only the executive group is represented on the board."
"Merely professionalizing the board of directors is not enough to achieve competent business leadership and at the same time the necessary independent check on executives."
"Except for specialists such as market analysts and the like, economists as a professional group have had surprisingly little influence on businessman."
"Although the Gordon and Howell report noted the diversity of approaches to the study of management, it was Harold Koontz who delineated the differences and applied the catchy label ‘‘management theory jungle.’’"
"Speak... of the separation of ownership and active leadership. Ordinarily the problem is stated in terms of the divorce between ownership and "control". This last word is badly overused, and it needs to be precisely defined... Our procedure... will be to study the ownership of officers and directors and then to ascertain the extent to which non-management stockholdings are sufficiently concentrated to permit through ownership the wielding of considerable power and influence (control?) over management by an individual, group or another corporation."
"Production management courses are often the repository for some of the most inappropriate and intellectually stultifying materials to be found in the business curriculum... many faculty members have little respect for such courses... and students complained more strongly to us about the pointlessness of the production requirement than of any other."
"In the infinitely complex economic system on which we rely for our daily bread, no productive function is more important than that of our business leaders. These men are charged with the responsibility of giving direction and unity to the efforts of the many who participate in economic activity. It is their job to make the plans and decisions which will transform economic effort into the particular goods and services wanted by a myriad of consumers. Conversely, it is their job also to translate consumers' needs into employment opportunities for labor and other economic resources"
"The majority of students studying for the master's degree in business are enrolled in makeshift programs which are generally unsatisfactory... Business administration gets a much larger portion of poor students and a smaller percentage of the best students than do the traditional professional fields."
"A study of business education in the United States was recently conducted by Professors Robert A. Gordon of the University of California (Berkeley) and John E. Howell of Stanford University. Their book, Higher Education for Business, has been published by Columbia University Press. Among their major recommendations are:"
"Corporation executives, particularly the more prominent ones, and wealthy individuals generally decry the fact that the "New Deal" has fostered a feeling of class-consciousness among workers and low-income groups. Class-consciousness, however, is not new in this country, and it is most pronounced among those groups who decry it while not recognizing the phenomenon themselves. Common social backgrounds, common business interests, and common fears, prejudices, and loyalties create among those who possess wealth and economic power a strong and clear-cut feeling of membership in an economic and social class."
"This pioneer work, written for both the professional economist and the businessman, has become a classic in its field. It is a detailed examination of the structure of the large business corporation in relation to its actual economic functioning. Because Gordon views the corporation not as an external institution but as organized human activity, his emphasis is on the personal and volitional elements in leadership, or how businessmen actually shape their practices. His analysis is based on a formidable mass of case material and statistical data"
"We hold that efficiency cannot itself be a "value." Rather, it operates in the interstices of a value system; it prescribes relationships (ratios or proportions) among parts of the value system; it receives its "moral content" by syntax, by absorption. Things are not simply "efficient" or "inefficient." They are efficient or inefficient for given purposes, and efficiency for one purpose may mean inefficiency for another."
"Students of administration, writes J. M. Gaus, have become "more uncertain in recent years as to the ends, aims and methods which they should advocate/' It is difficult to view in their entirety and in perspective the writings on public administration that now pour from the presses. But this is hardly necessary to confirm the truth of Gaus' statement."
"From Taylor and his associates, on the one hand, and Allen, Bruere, and Cleveland, on the other, there extends a firm resolve to enlarge the domain of measurement, an unbroken missionary endeavor to extend the suzerainty of "the facts." The pioneers began with inquiries into the proper speed of cutting tools and the optimum height for garbage trucks; their followers seek to place large segments of social life or even the whole of it upon a scientific basis."
"Historically, "public administration" has grown in large part out of the wider field of inquiry, "political science." The history of American political science during the past fifty years is a story much too lengthy to be told here, but some important general characteristics and tendencies it has communicated to or shared with public administration must be noted."
"[Messianic tendencies of management thought, especially scientific management had the tendency] to extend the objective, positivist approach to an ever-enlarging complex of phenomena."
"The Gospel of Efficiency. Every era, as Carl Becker has reminded us in his Heavenly City of the Eighteenth Century Philosophers, has a few words that epitomize its world-view and that are fixed points by which all else can be measured. In the Middle Ages they were such words as faith, grace, and God; in the eighteenth century they were such words as reason, nature, and rights ; during the past fifty years in America they have been such words as cause, reaction, scientific, expert, progress and efficient. Efficiency is a natural ideal for a relatively immature and extrovert culture, but presumably its high development and wide acceptance are due to the fact that ours has been, par excellence, a machine civilization. At any event, efficiency grew to be a national catchword in the Progressive era as mechanization became the rule in American life, and it frequently appears in the literature of the period entangled in mechanical metaphor."
"Perhaps most important of the theoretical movements now influencing American administrative study is scientific management. At the level of technique or procedure, borrowing from and liaison with scientific management will undoubtedly continue. Although some doctrines, such as "pure theory of organization," have already affected public administration, how influential other theoretical aspects of scientific management will be remains to be seen. In its "democratic" or "anarchistic" doctrines, conceivably, there is enough force to reconstruct present patterns of administrative thought, at least if conditions become favorable."
"Procedure, properly applied, allows specialization to be carried to its optimum degree and effects the most efficient division of labor. Procedure not only divides labor; it also divides-and fixes-responsibility. Procedure thus is a means of maintaining order and of achieving regularity, continuity, predictability, control, and accountability. It is a means of maximizing control of the subjective drives of an organization's members, of assuring that their official actions contribute-and, if possible, that their private loyalties conform-to the organization's objectives. From a general political angle, procedure ensures equality of treatment-a value of great significance to the citizen."
"Procedure is not a unique feature of public administration. It is a concomitant of all organized activity, and many procedures are equally usable by private administration or public administration. Private as well as public "red tape" can be time-consuming and annoying to those affected, as anyone can testify who has tried to exchange a purchase without a sales slip or to cash a check without "proper identification."
"It is procedure that governs the routine internal and external relationships - between one individual and another; between one organizational unit and another; between one process and another; between one skill or technique and another; between one function and another; between one place and another; between the organization and the public; and between all combinations and permutations of these. It is by means of procedure that the day-to-day work of government is done-mail sorted, routed and delivered; deeds recorded; accounts audited; cases prosecuted; protests heard; food inspected; budgets reviewed; tax returns verified; data collected; supplies purchased; property assessed; inquiries answered; orders issued; investigations made; and so forth endlessly."
"Among organization theorists general, if not universal agreement obtains that it is proper to view the development of organization theory as divided into three periods. Conventionally, this "history" is regarded as beginning early in this century; and the three periods are customarily are designed by the terms classic, neo-classic and modern... The classical period has its beginning, in the conventional view, with Frederick W. Taylor and Henri Fayol... [and] reaches its high point in the thirties with the work of James Mooney and of the editors and authors of the Paper in the Science of Administration. The neo-classical wave is seen as beginning with the Hawthorne experiments in the late twenties. These experiments challenge the formality and rationality of classical theory with the "discovery"of human relations."
"This is a study of the public administration movement from the viewpoint of political theory and the history of ideas. It seeks to review and analyze the theoretical element in administrative writings and to present the development of the public administration movement as a chapter in the history of American political thought."