Does the double integral of ln(1 - xy)/(1 - xy) over [0,1]x[0,1] have a known closed-form?

I was looking at this double integral:

∬ over [0,1]×[0,1] of ln(1 - xy)/(1 - xy) dx dy

It looks simple in structure continuous over the unit square and reminiscent of integrals that collapse to zeta values.

But I couldn’t find any reference to a known closed-form.

Is this integral known to evaluate to a specific constant (e.g., involving pi or zeta values)? If yes, what are the techniques typically used to evaluate such integrals?

Any direction or insight would be appreciated.

Posted Aug 7, 2025, 12:56 AM UTC

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