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Soit $X$ et $Y$ des v.a.r dindependantes et supposons que $P(X+Y=a)=1$ ou $a$ est une constante. Montrer que $X$ et $Y$ sont p.s des constantes .

So unfortunately I don't know french , what does p.s mean in english ? Is it almost everywhere (a.e) ?

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    $\begingroup$ This is not a mathematics question per se, but a translation question. The existing answer is adequate and solves the OP's needs $\endgroup$
    – Mittens
    Jul 30, 2021 at 3:23

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It stands for "presque sûrement", which means "almost surely".

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