nonnegative orthant

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Orthant — In two dimensions, there are 4 orthants (called quadrants) In geometry, an orthant[1] or hyperoctant[2] is the analogue in n dimensional Euclidean space of a … Wikipedia
Metzler matrix — In mathematics, a Metzler matrix is a matrix in which all the off diagonal components are nonnegative (equal to or greater than zero) It is named after the American economist Lloyd Metzler. Metzler matrices appear in stability analysis of time… … Wikipedia
Dual cone and polar cone — A set C and its dual cone C * … Wikipedia
Convex cone — In linear algebra, a convex cone is a subset of a vector space over an ordered field that is closed under linear combinations with positive coefficients. A convex cone (light blue). Inside of it, the light red convex cone consists of all points… … Wikipedia

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