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IdentityMat

the identity matrix

Syntax
IdentityMat(R:RING, N:INT):MAT

Description
This function returns the NxN identity matrix.

Example
 /**/ IdentityMat(QQ,3);
matrix([
  [1, 0, 0],
  [0, 1, 0],
  [0, 0, 1]
])