Good intro to: Quadratic Forms and Convexity
https://www.dr-eriksen.no/teaching/GRA6035/2010/lecture4.pdf

Concave Upward and Downward

https://www.mathsisfun.com/calculus/concave-up-down-convex.html

Convex functions and K-Convexityhttps://ljk.imag.fr/membres/Anatoli.Iouditski/cours/convex/chapitre_3.pdf

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Sayed Ahmed

BSc. Eng. in Comp. Sc. & Eng. (BUET)
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