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Let phi_0 be the latitude for the origin of the Cartesian coordinates and lambda_0 its longitude, and let phi_1 and phi_2 be the standard parallels. Then for a unit sphere, ...

If A and B are equal by definition (i.e., A is defined as B), then this is written symbolically as A=B, A:=B, or sometimes A≜B.

The sum of sets A and B in a vector space, equal to {a+b:a in A,b in B}.

If, in two solids of equal altitude, the sections made by planes parallel to and at the same distance from their respective bases are always equal, then the volumes of the ...

Two quantities a and b which are not equal are said to be unequal, and this relationship can be denoted a!=b.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

An isosceles triangle is a triangle with (at least) two equal sides. In the figure above, the two equal sides have length b and the remaining side has length a. This property ...

A fixed point for which the stability matrix has equal nonzero eigenvectors.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

If two complementary Plücker characteristics are equal, then each characteristic is equal to its complement except in four cases where the sum of order and class is 9.