*A row (column) of a matrix is called “extraneous” if it is a linear combination of the other rows (columns). The author shows that deleting an extraneous row or column of a...*

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Displaying 1051 - 1060 of 1213

*A new and elementary proof for a theorem in differential equations*

*The author explores the relationship between saddle points of surfaces and the inflection points of the projected curves.*

*Analytic proofs for the generation of conic sections*

*The author presents a simple proof of a special case of Dirichlet`s celebrated theorem on primes in arithmetic progressions.*

*An arctangent identity is presented visually.*