Pretty much as the question states. I'm not a native speaker, but i have a strong feeling that the auxiliary verb is missing in the second clause - I have an overwhelming urge to want to hear "das Cantor uns geschaffen HAT".
Is this an archaic or literary preterit form of schaffen, rather than the Particip II it looks and sounds like?
This famous statement was made by the great David Hilbert, when intuitionists like Brouwer were criticizing his programme's adoption of transfinite, nonconstructive mathematics.