>> Similarly, this fragment can appear inside a statement, such as "f(x) 
>> = 3 if x = sqrt(y/z), otherwise 9". In that case, the "x = sqrt(y/z)" 
>> part is clearly a conditional test.
> 
> I don't remember 'if' being part of my maths course. Yet yhere must be 
> specialized subfields where it is defined.

How about

   sinc(x) = if x = 0 then 1 else sin(x) / x

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