In the mathematical field of graph theory, the pancake graph Pn or n-pancake graph is a graph whose vertices are the permutations of n symbols from 1 to n and its edges are given between permutations transitive by prefix reversals. The pancake graph of dimension n, Pn, is a regular graph with vertices. Its degree is n − 1, hence, according to the handshaking lemma, it has edges. Pn can be constructed recursively from n copies of Pn−1, by assigning a different element from the set {1, 2, …, n} as a suffix to each copy.
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