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We prove the edge and bulk universality of random Hermitian matrices withequi-spaced external source. One feature of our method is that we use neither aChristoffel-Darboux type formula, nor a double-contour formula, which arestandard methods to prove universality results for exactly solvable models.This matrix model is an example of a biorthogonal ensemble, which is a specialkind of determinantal point process whose kernel generally does not have aChristoffel-Darboux type formula or double-contour representation. Our methodsmay showcase how to handle universality problems for biorthogonal ensembles ingeneral.

Universality for random matrices with equi-spaced external source: a case study of a biorthogonal ensemble