<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 21 Feb 2024 at 10:07, Pétiard François <<a href="mailto:petiard.francois@free.fr">petiard.francois@free.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Maybe it's : w*w is the set {x*y : x in w ; y in w} ?<br>
<br></blockquote><div><br></div><div>indeed, it's the correct notation, thank you.</div><div><br></div><div><br></div><div>--</div><div>luigi</div></div></div>