Re: [math-fun] Some questions from the 2018 Putnam Exam

4 Dec 2018

      Duh! I could've sworn I included the instruction

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   Calculate the determinant of M.
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but apparently not.

But that's the problem:  Find the determinant of that matrix.

Sorry for the oversight.

—Dan

Allan Wechsler and/or Mike Stay wrote stuff like:
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A2 is really easy!
and
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I think you left out the punch line.
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On Tue, Dec 4, 2018 at 5:37 PM Dan Asimov <dasimov@earthlink.net> wrote:
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questions from the recent Putnam Exam ...
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A2 Let S_1, S_2, ..., S_(2n−1) be the nonempty subsets of {1,2,...,}
in some order, and let M be the (2n−1)×(2n−1) matrix whose (i,j)th
entry m(i,j) = 0 if S_i ∩ S_j is empty; m(i,j) = 1 otherwise.
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