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Graph homomorphisms via vector colorings
Published 2020“…Our approach allows to reprove, without using the Erdős–Ko–Rado Theorem, that for n>2r the Kneser graph K n:r and the q-Kneser graph qK n:r are cores, and furthermore, that for n∕r=n ′ ∕r ′ there exists a homomorphism K n:r →K n ′ :r ′ if and only if n divides n ′ . …”
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