s********l
发帖数: 4 | 1 E_y(f(x;y)) of a function f(x;y), convex in x for each y,
how can I go one step further to show that over the
R.V. y is convex.Is this joitly convex in x and y or separately? thanks a
lot!!!! | H****h
发帖数: 1037 | 2 没看明白。 E_y(f(x;y))是什么意思？最后你想证明什么结论？
【在 s********l 的大作中提到】
: E_y(f(x;y)) of a function f(x;y), convex in x for each y,
: how can I go one step further to show that over the
: R.V. y is convex.Is this joitly convex in x and y or separately? thanks a
: lot!!!!
| s********l
发帖数: 4 | 3 f(x,y) is convex in x for each y (fixing y first), I want to show that f(x,y) is also convex over y.further I wanna know whether this is jointly convex or separately. Thanks again | c*******v
发帖数: 2599 | 4 y从0到pi/2
(sin y) x^2 对每个固定的y是凸的。
但是固定x,就对y不凸。
E_y(f(x;y)) of a function f(x;y), convex in x for each y,
how can I go one step further to show that over the
R.V. y is convex.Is this joitly convex in x and y or separately? thanks a
lot!!!!
【在 s********l 的大作中提到】
: E_y(f(x;y)) of a function f(x;y), convex in x for each y,
: how can I go one step further to show that over the
: R.V. y is convex.Is this joitly convex in x and y or separately? thanks a
: lot!!!!
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