"It is hardly conceivable that these writers [Aryabhata, Brahmagupta, Bhaskaracharya etc.], should have been unacquainted with the Greek sources, which were available to Varahamihira [the earliest of these writers]; it is even less conceivable that they [the Indian writers], acquainted with the same, did not let themselves be influenced by them [the Greek sources]. Thus, it is again a conclusion to be assumed in advance, only waiting for a confirmation, that Greek mathematics had brought its traces into those Indian works."