"The unknown mountain nests in the inhospitable interior of southern Calabria are usually connected only by a mule tra…"

"Now, I should like to say something else to you about the connection with music, primarily that of Bach, i.e. the Fug…"

"But to get back to the point: did you ever imagine that your dad, who lives so far away from the bustle and intrigue …"

"In mathematical quarters, the regular division of the plane has been considered theoretically.. .Does this mean that …"

"After the first proof [of 'Sphere Spirals'] my high expectations were, as always, greatly disappointed. I am now stru…"

"As long as there have been men.. ..upon this globe.. ..we have held firmly to the notion of.. ..all of which must con…"

"The ideas that are basic to [my work] often bear witness to my amazement and wonder at the laws of nature which opera…"

"The fact that, from 1938 onwards, I concentrated more on the interpretation of personal ideas was primarily the resul…"

"It is human nature to want to exchange ideas, and I believe that, at bottom, every artist wants no more than to tell …"

"(2) Moreover, in what ways are the edges of such a tile related to each other by isometries?"