Noncongruent quasi-prime matrices in prime dimensions

For matrices AA and BB of size m×nm\times n, say that they are congruent if there are invertible square matrices UU and VV of orders mm and nn, respectively, such that UA=BVUA=BV. A quasi-prime matrix is the product of two quasi-invertible semi-prime matrices, where a semi-prime matrix is a rectangular matrix whose smaller dimension is prime. The quasi-prime noncongruence conjecture. For every natural number kk, there are infinitely many prime numbers nn and (n2k)×n(n-2k)\times n quasi-prime matrices that are not congruent to each other.

This is presented as a weak form of the preceding conjecture: it retains the existence of infinitely many noncongruent matrices but replaces the semi-prime and quasi-invertibility assertion with quasi-primality. The supplied context gives no evidence that it has been resolved.

Sources & referencesView supporting material

Primary source

Haoming Wang, “Factorization of a prime matrix in even blocks”, arXiv:2408.00627 (2024).

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