What meaning 'vanish' in math [closed]
Solution 1:
Vanishing:
A quantity which takes on the value zero is said to vanish.
For example, the function f(z)=z^2 vanishes at the point z=0. For emphasis, the term "vanish identically" is sometimes used instead, meaning the quantity in question does not merely vanish by all appearances, but is mathematically identically equal to zero.
A quantity that is nonzero everywhere is said to be nonvanishing.
(mathworld.wolfram.com)