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From: hitlong@yahoo.com (gharnagel)
Newsgroups: sci.physics.relativity
Subject: Re: the notion of counter-intuitiveness in relativistic physics
Date: Sun, 11 Aug 2024 17:42:06 +0000
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On Sun, 11 Aug 2024 14:30:49 +0000, Richard Hachel wrote:

> Le 11/08/2024 à 15:16, hitlong@yahoo.com (gharnagel) a écrit :
>> On Sun, 11 Aug 2024 7:29:31 +0000, Richard Hachel wrote:
>
>> Then you should write it U.cosu, not cosu.U.
>
> ? ? ?
>
> R.H.

Sorry, I thought I was being obvious.

When you write cosu.U, it can be taken either as
cos(u.U) or cos(u)U.  Writing as Ucosu removes
the ambiguity, mostly, but it's probably best to
use parentheses.  Remember PEMDAS: evaluate
what's inside parentheses first, then exponents,
then multiplication, division, addition then
subtraction.  The mnemonic is Please Excuse My
Dear Aunt Sally.