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Results tagged with linear-algebra
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user 47322
Questions about the properties of vector spaces and linear transformations, including linear systems in general.
2
votes
Checking $f(x_1,y_1)f(x_2,y_2)-f(x_1,y_2)f(x_2,y_1) \ge 0$
To follow up @igor answer, the equation can be written as:
$$ \dfrac{\partial^2 \ln f}{\partial x \partial y} \geq 0.
$$
Moreover, the inequality is not only necessary, bu sufficient, since:
$$
\ln \ …
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