[to/with sth; see also: difference, oppose
1
Note that, in contrast to F, the function G is bounded.
[Not: “contrary to F'']
In contrast, Theorem 2 shows that......
By contrast, T does not have this symmetry.
This is in marked contrast to the behaviour of orthonormal sets in a Hilbert space.
Note the contrast with Theorem 3.
2
[with sth; see also: differ] This contrasts sharply with the situation in metrizable spaces.
This contrasts with (but does not contradict) Theorem 2 of [6].