例句與造句

1. The sum of two proper convex functions is not necessarily proper or convex.
2. The infimal convolution of two proper convex functions is convex but not necessarily proper convex.
3. The infimal convolution of two proper convex functions is convex but not necessarily proper convex.
4. A proper convex function is closed if and only if it is lower semi-continuous.
5. For instance if the sets A \ subset X and B \ subset X are non-empty convex sets in the vector space " X ", then the indicator functions I _ A and I _ B are proper convex functions, but if A \ cap B = \ emptyset then I _ A + I _ B is identically equal to + \ infty.
6. It's difficult to find proper convex in a sentence. 用proper convex造句挺難的