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'If' versus 'Iff'



 
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Painstakingly investigation | Subject-verb agreement
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'If' versus 'Iff' #1 (permalink) Thu Aug 24, 2006 13:29 pm   'If' versus 'Iff'		  
Hi

Could you please tell me if I can use Iff as freely as I can use If. I think Iff means 'If and only iff'

Tom
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If #2 (permalink) Thu Aug 24, 2006 13:37 pm   If		  
Hi Tom,

Sorry, never heard of it!

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'If' versus 'Iff' #3 (permalink) Thu Aug 24, 2006 13:43 pm   'If' versus 'Iff'		  
Tom wrote:
Hi

Could you please tell me if I can use Iff as freely as I can use If. I think Iff means 'If and only iff'

Tom

Hi
I remember iff from my university time. It is widely used in mathematics (in particular, in logic) - yes, for if and only if
So, it's more strict than just 'if.

In mathematics it is equvelent to necessary and suffucient conditions. When you prove conditional (theorem) statement 'in both sides' (directly and vice versa).

In logics
A iff B means that A and B both true (simultaneously) OR A and B both false (simultaneously)
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'If' versus 'Iff' #4 (permalink) Thu Aug 24, 2006 14:08 pm   'If' versus 'Iff'		  
.
Too erudite for general usage, Tom. It is just a mathematical acronym.
.
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'If' versus 'Iff' #5 (permalink) Sun Aug 27, 2006 3:30 am   'If' versus 'Iff'		  
They also use iff in philosophy and linguistics. The average person walking down the street doesn't know what it means.
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Painstakingly investigation | Subject-verb agreement
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