handshaking_lemma (189B)
1 # Handshaking lemma 2 3 https://en.wikipedia.org/wiki/Handshaking_lemma 4 5 [Lemma] about [degree] and [parity] in [graph_undirected] 6 7 Up: [lemma], [graph_theory] 8 9 See also: [friendship_theorem]
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