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- matmul[a_, b_] :=
- {{vecmul[a[[1, 1]], b[[1, 1]]] + vecmul[a[[1, 2]], b[[2, 1]]],
- vecmul[a[[1, 1]], b[[1, 2]]] + vecmul[a[[1, 2]], b[[2, 2]]]},
- {vecmul[a[[2, 1]], b[[1, 1]]] + vecmul[a[[2, 2]], b[[2, 1]]],
- vecmul[a[[2, 1]], b[[1, 2]]] + vecmul[a[[2, 2]], b[[2, 2]]]}}
- matmul[a_,b_] := Inner[vecmul[#1, #2] &, a, b]
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