<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Sep 1, 2015 at 3:50 PM, Alexander Belopolsky <span dir="ltr"><<a href="mailto:alexander.belopolsky@gmail.com" target="_blank">alexander.belopolsky@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="gmail_extra">>>> (t1 - u) - (t2 - u) == t2 - t1</div><div class="gmail_extra">False</div></blockquote></div><br>I messed up the order.  the above should have been</div><div class="gmail_extra"><br></div><div class="gmail_extra"><div class="gmail_extra">>>> (t1 - u) - (t2 - u) == t1 - t2</div><div class="gmail_extra">False</div></div></div>