Quote of Sun Zi in Recursion

[kigawas]

Please verify that the error is present in the most recent revision before reporting. Both in the lecture note and the book

https://courses.engr.illinois.edu/cs374/sp2021/notes/01-recursion.pdf http://jeffe.cs.illinois.edu/teaching/algorithms/book/01-recursion.pdf

Chapter number or note title: [title] Recursion

Page number: [page] 1 Error description: [error]

The era in — Sun Zi, The Art of War (c. 400CE) is incorrect, which should be around 500BCE

Suggested fix (if any): [fix] — Sun Zi, The Art of War (c. 500BCE)