Given a C 2 L-smooth function the Lipschitz condition is: | | ∇ f (...

Kyler Oconnor

Kyler Oconnor

Answered

2022-11-22

Given a C 2 L-smooth function the Lipschitz condition is:
| | f ( x ) f ( y ) | | L | | x y | |
Are these conditions only true for convex C 2 function? What will change If f is C 2 and concave?

Answer & Explanation

Kalmukujobvg

Kalmukujobvg

Expert

2022-11-23Added 14 answers

This condition is completely independent of convexity. As long as we can connect any two points in your domain to be able to use the argument, the two conditions are equivalent for C 2 functions. This is true for convex domains. No assumption on f is needed, apart from regularity.

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