[Math] What does the symbol $\leqq$ mean

notation

What does the symbol $\leqq$ mean?

I am reading a paper on by Lehman on dependence, and here I find

$\ldots$we compare the probability of any quadrant $X \leqq x$, $Y \leqq y$ under the distribution $F$ of $(X,Y)$ with the corresponding probability in the case of independence”.

Is $\leqq$ the same as $\leq$?

Best Answer

I would say that it is a symbol of less or equal "without contracting," which is the same as putting $\leq$