Aryabhata's recursive method = "Euler" method (will cover this in detail, later)
Nilkantha's planetary model= Tychonic model (see my book on Indian calendar) (Tycho as Royal astronomer to the "Holy Roman empire" was a natural recipient of stolen Indian texts)
Madhava's sine values = Clavius' trigonometric values (which were an interpolated version)
i.e., A mathematical proof is a sequence of statements in which each statement is either an axiom, or is derived from preceding statements by some rule of reasoning