>>> 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.

> I've never seen it written with an else.

Me neither, that sounds more like a programming language than math notation.

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