Accordingly they can be associated in a one-one correspondence with the positive and negative real numbers.
Hence there will be a one-one relation between the state of a given person's mind and the state of the whole material universe.
"Give me one-one," she will put it, with an impersonality as fine as if she were calling for four figures.
The notion of a one-one correspondence between rows may be extended to flat and axial pencils, viz.
A congruence-group is a finite continuous group of one-one transformations, containing the identical transformation.