Interaction between Indians and Greeks in Ancient Days

To what extent Greeks had interacted with Indians and learned philosophy from them.

King Cyrus of Persia (600 or 576 BC to 530 BC) conqured up to Indus River and so a part of India became a part of Persian Empire. Greece was also part of this Persian empire. Hence, interaction between some Indians and some Greek is a historical possibility. Some Greek authors describe India and even say that some Greek wisemen had conversations with Indian wisemen. A statement that  says Socrates interacted with an Indian wiseman in Greece itself was available.


India and the Greek World
http://www.adolphus.nl/xcrpts/xcsedlar.html

http://www.in2greece.com/english/historymyth/history/general/ancient.htm

http://en.wikipedia.org/wiki/Cyrus_the_Great

http://www.iranchamber.com/history/cyrus/cyrus.php

http://en.wikipedia.org/wiki/Pythagoras

http://en.wikipedia.org/wiki/Thomas_McEvilley

Topic started because, Mr. S. Gurumurthy mentioned it in the lecture on 18 April 2015.