Convexity of set A = {(x,y) in R^2 | x^4+y^4 =< 1, x>=0

peteryellow · Mar 18, 2008

How can I show that the set A = {(x,y) in R^2 | x^4+y^4 =< 1, x>=0 y>=0} is convex.

CHatUPenn · Mar 21, 2008

I am sure it can be shown by definition, but I propose an easy way (not rigorous though)

The function is (weakly) convex
The lower contour set (=<1) of a convect function is convex.

Convexity of set A = {(x,y) in R^2 | x^4+y^4 =< 1, x>=0

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