doubly even magic squares arithmetic progressions magic squares parity dürer's magic square natural numbers generalized euler-tricomi equation linear partial differential equations mathematics grupos de klein matematica geometric characterization magic hypercubes ordinary differential equations linear ordinary differential equations euler-tricomi equation equações diferenciais parciais lineares recreational math culture quadrados magicos pandiagonal magic squares nagarjuniya nagarjuna albrecht durer's magic square arithmetic progression gaussian ¨ elimination method durer’s magic square keywords}: arithmetic progressions parity. princípios básicos da matemática do movimento. matemática computacional álgebras de boole semi-magic squares java language. snake-shaped matrices
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