From e1b0305ab1f7c2bfbd2600c2e636ec0061fa2566 Mon Sep 17 00:00:00 2001
From: Jackson Walters <jacksonwalters@gmail.com>
Date: Mon, 3 Mar 2025 15:53:28 -0500
Subject: [PATCH] remove unnecessary import, singularity check

if the matrix `U` is singular, the process will still result in a matrix but it will fail to have the expected property, namely `B*B.H == U`.
---
 src/sage/matrix/matrix2.pyx | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/sage/matrix/matrix2.pyx b/src/sage/matrix/matrix2.pyx
index e568083fbd0..dd63273548a 100644
--- a/src/sage/matrix/matrix2.pyx
+++ b/src/sage/matrix/matrix2.pyx
@@ -12988,14 +12988,10 @@ cdef class Matrix(Matrix1):
             True
         """
         from sage.matrix.constructor import identity_matrix
-        from sage.misc.functional import sqrt
 
         if not self.is_hermitian():
             raise ValueError("matrix is not Hermitian")
 
-        if self.is_singular():
-            raise ValueError("matrix must be nonsingular")
-
         F = self._base_ring
         n = self.nrows()