The best replacement for matrices is matrices.

The best alternatives to matrices are rated as following:
★★★★★  matrices
★★★★  matrix
★★★★  matrixes
★  nearly commuting matrices
★  determinants
★  vectors
★  tensors

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Speaking about matrices, one probably shouldn't forget about inverses.

Other search terms related to matrices and their ratings are:
★★★★★ inverses
★★ x and y
vectors
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