How to declare undefined mathematical function

02122019, 04:24 PM
Post: #1




How to declare undefined mathematical function
I would like to declare a function say, x(t) but without saying what x(t) is.
Thus when I evaluate an integral from infinity to infinity of dirac(τ)x(tτ) dτ the answer should be x(t). Now, this would work with sin(x) because there is no simplification of sin(x). Is there a way to define such a function? And how would the syntax work to make sure x(ttau) is functional notation, not x*(tτ). Thank you! (See attachment for the integral I'm trying to evaluate.) 

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