Lemmas in graph theory

In graph theory, a "lemma" is a proposition or statement that is proved and used as a stepping stone to prove a larger theorem. The term does not refer to a specific concept in graph theory itself but is rather a general mathematical term. Lemmas are commonly utilized to establish critical results or intermediate claims that help in constructing proofs of more significant theorems. They often simplify complex arguments by breaking them down into more manageable, verifiable pieces.