$25
Numerical Optimization by Jorge Nocedal, Stephen Wright for 25$
https://www.amazon.com/Numerical-Optimization-Operations-Financial-Engineering/dp/0387303030/ref=sr_1_3?crid=27IAJNYEG388W&dchild=1&keywords=numerical+optimization&qid=1630802031&sprefix=numerical+opti%2Caps%2C221&sr=8-3
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