question about u'

[kukuruku]

Hi,I have to write code in java and in the description is this symbol u'
Can anybody tell me what is the meaning of it

Set (u')

[bibiki]

could be the derivative a function named u. depends on context. if it is calculus, it most likely is the derivative of u.

[kukuruku]

This is part of the description of the problem
Set (u',v') to (1,0) and (u,v) to (0,1); (m',n') to (m,n)

[JamesCherrill]

Looks like a suffix to indicate multiple values for something
basic values are m and n, second values are m1, n1 (etc) - like an array with the little 1 as the array index.