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The article presents proposed mathematical problems and solutions. Let ABCD be a convex quadrilateral and hypothesize there is a point M on the diagonal BD having the property that the perimeters of CBM and ABM are the same and the perimeters of CDM and ADM are the same. It mentions that adjacency matrices with respect to vertices' reorderings are attained by fusing by a permutation matrix.

The article presents questions and answers related to mathematics. A reader asks about a sequence of distinct complex numbers, and a sequence of nonzero real numbers, and real numbers. Another reader asks about the least number M. A person asks a question about an invertible matrix with nonnegative integer entries.

Presents a list of mathematical problems and solutions. Solution of Eigenvalues of a bidiagonal matrix; Application of the Mellin Transform; Proposition on incomplete gamma and error functions.

Presents several mathematical problems and solutions. Determinant of a matrix in two variables; Generators of ideals of matrices over finite fields; Angles with rational cosines; Derangements that do not rise too fast; Appearance of the Catalan numbers.

Presents solutions to several mathematical problems. Nonsingular sums of matrices; Points on a sphere; Parallelogram circumcenters.

Presents solutions to mathematical problems. Discussion on tiling rectangles with trominoes; Property of normal matrices; Information on tangent lines and collinear points.

Presents mathematical problems and solutions. Cramer's rule for non-square matrices; Identity for connected diagraphs; Simultaneous squares from arithmetic progressions; Equation involving the totient.