Re: Empty set

From: Stephan Stiller <stephan.stiller_at_gmail.com>
Date: Fri, 13 Sep 2013 02:54:05 -0700

I've never seen it in math proper, is what I meant, but ...
> The { [ ( ) ] } hierarchy is used in chemical nomenclature. It is
> specified by IUPAC (International Union of Pure and Applied Chemistry).
>
> For example:
> acetone
> (/R/)-/O/-{2-[4-(α,α,α-trifluoro-/p/-tolyloxy)phenoxy]propionyl}oxime
... it looks like someone spotted the mythical beast, U+666!

Or is it just a mutation ascended from a bath of noxious chemical ooze?

Stephan
Received on Fri Sep 13 2013 - 04:55:46 CDT

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