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Returns the DCP curvature of an expression as a string.
curvature(x)
Character: "CONSTANT", "AFFINE", "CONVEX", "CONCAVE", or "UNKNOWN".
"CONSTANT"
"AFFINE"
"CONVEX"
"CONCAVE"
"UNKNOWN"
A CVXR expression.
is_convex(), is_concave(), is_affine(), is_constant()
is_convex()
is_concave()
is_affine()
is_constant()