assumptions in integrals' computation in programming mode

[robmio]

Good morning, if I want to calculate the following integral:

int((t-x)^(-1/2)*ln(x),x,0,t)

it is necessary to make the following assumptions:

assumes(t>0); additionally(t>x).

My question is the following: how can I assign an assumption to a variable in #cas ... #end programming mode?

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Thanks a lot, Roberto (robmio)