In mathematics, an element of a *-algebra is called positive if it is the sum of elements of the form a ∗ a {\displaystyle a^{*}a} . Let A {\displaystyle...

containing the first four positive integers ( A = { 1 , 2 , 3 , 4 } {\displaystyle A=\{1,2,3,4\}} ), one could say that "3 is an element of A", expressed notationally...

A positive-temperature-coefficient heating element (PTC heating element), or self-regulating heater, is an electrical resistance heater whose resistance...

the same sign as that of an electron. Percent sign Plus–minus sign Positive element Signedness Symmetry in mathematics Weisstein, Eric W. "Sign". mathworld...

a ≤ g + b. An element x of G is called positive if 0 ≤ x. The set of elements 0 ≤ x is often denoted with G+, and is called the positive cone of G. By...

cemented achromatic doublet consisting of one thin negative element and one thin positive element, both of equal power; such a doublet would result in a compound...

a lattice that is not a positive integer multiple of another element in the lattice Primitive element (coalgebra), an element X on which the comultiplication...

Howard Bloom in 1970, that is used to test whether an element is a member of a set. False positive matches are possible, but false negatives are not – in...

The finite element method (FEM) is a popular method for numerically solving differential equations arising in engineering and mathematical modeling. Typical...

of positive real numbers R + {\displaystyle \mathbb {R} ^{+}} (not including 0 {\displaystyle 0} ) does not have a minimum, because any given element of...