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    Graph homomorphisms via vector colorings by Godsil, Chris, Roberson, David E., Rooney, Brendan, Šámal, Robert, Varvitsiotis, Antonios

    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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    Journal Article
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