Symbol in context

$Z^2$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

the square of Z; the height.

Article-grounded definition

the square of Z; the mass number.

ds^2 = -U(Z)^2\,dx_0^2 + dZ^2 + dx^2 + dy^2, \qquad x_0 := ct, \qquad U(Z) := 1 + \frac{gZ}{c^2}.

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

Z^2

the square of Z; the mass number.

M(A,Z)\,c^2 \approx \alpha(A) - \beta(A)\,Z + \gamma(A)\,Z^2 \mp \delta(A)

This equation gives an approximation: it relates the quantities while allowing an approximation.