In the article the formula for Laplace expansion is proved.
@article{bwmeta1.element.doi-10_2478_v10037-007-0016-5, author = {Karol Pak and Andrzej Trybulec}, title = {Laplace Expansion}, journal = {Formalized Mathematics}, volume = {15}, year = {2007}, pages = {143-150}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_2478_v10037-007-0016-5} }
Karol Pak; Andrzej Trybulec. Laplace Expansion. Formalized Mathematics, Tome 15 (2007) pp. 143-150. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_2478_v10037-007-0016-5/
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