Question: Do the Gaussian reduction to check the formula for 3 Ã 3 matrices stated in the preamble to this section. is nonsingular iff aei +

Do the Gaussian reduction to check the formula for 3 × 3 matrices stated in the preamble to this section.
Do the Gaussian reduction to check the formula for 3

is nonsingular iff aei + bfg + cdh - hfa - idb - gec ‰  0

cf.l

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