Comments on: QED http://curmi.com/blog/2007/09/23/qed/ Mac stuff, Tech stuff, Weird stuff Sun, 01 Jan 2012 14:20:01 -0700 hourly 1 http://wordpress.org/?v=3.0 By: James Madley http://curmi.com/blog/2007/09/23/qed/comment-page-1/#comment-20002 James Madley Tue, 03 Jun 2008 11:14:18 +0000 http://curmi.com/blog/2007/09/23/qed/#comment-20002 It took me a while to realise but my Yr11 Maths teacher last year used it once or twice. He did explain it but most of the class must have had (and some still have) brain damage or something. Concerning the ∴ symbol; yes it is still used. Very useful. But I've never heard of a "for all" symbol. It took me a while to realise but my Yr11 Maths teacher last year used it once or twice. He did explain it but most of the class must have had (and some still have) brain damage or something.

Concerning the ∴ symbol; yes it is still used. Very useful.

But I’ve never heard of a “for all” symbol.

]]> By: Clive Dickinson http://curmi.com/blog/2007/09/23/qed/comment-page-1/#comment-5763 Clive Dickinson Sun, 30 Sep 2007 23:25:27 +0000 http://curmi.com/blog/2007/09/23/qed/#comment-5763 Ah, the good old days.... QED - Latin version Quod erat demonstrandum (that which was to be demonstrated) QED - alternative version quite easily done I suppose they no longer use the 'therefore' symbol either (three dots in a triangle arrangement) or the 'for all' symbol (upside down A) This is probably the thin end of the wedge (or the apex of the cone?). Soon the mathematical language will become as derelict and grammarless as spoken English. Ah, the good old days….

QED – Latin version
Quod erat demonstrandum
(that which was to be demonstrated)

QED – alternative version
quite easily done

I suppose they no longer use the ‘therefore’ symbol either (three dots in a triangle arrangement) or the
‘for all’ symbol (upside down A)

This is probably the thin end of the wedge (or the apex of the cone?). Soon the mathematical language will become as derelict and grammarless as spoken English.

]]> By: David http://curmi.com/blog/2007/09/23/qed/comment-page-1/#comment-5660 David Wed, 26 Sep 2007 06:50:43 +0000 http://curmi.com/blog/2007/09/23/qed/#comment-5660 Sorry to spoil the sample, but I'm 26, and went to RMIT, and of course I know what QED means! Do they not teach this at school any more? Sorry to spoil the sample, but I’m 26, and went to RMIT, and of course I know what QED means! Do they not teach this at school any more?

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