>>>> How about
>>>>
>>>>   sinc(x) = if x = 0 then 1 else sin(x) / x
>>>>
>>> nope, never seen that
>>
>> I've seen it as
>>   sinc(x) = 1 if x = 0
>>   sinc(x) = sin(x)/x if x /= 0
> 
> In our math classes we always wrote it just like that, but usually only 
> the "sinc(x)" once and a curly bracket around the two options IIRC.

Indeed. But you can't really do that with ASCII, so I wrote the nearest 
equivilent.

>> I've never seen it written with an else.
> 
> Me neither, that sounds more like a programming language than math 
> notation.

Well, technically the above *is* a valid Haskell function declaration...

[Or rather, it becomes so if you change "if x = " to "if x == 0" - which 
probably proves Andrel's original point.]

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