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A possible solution is writing before your lemma a sentence like the following: "The following result is easy and probably already known, however we include a proof for the convenience of the reader."
A possible solution is writing before your lemma a sentence like the following: "The following result is easy and probably already known, however we include a proof for convenience of the reader."
A possible solution is writing before your lemma a sentence like the following: "The following result is easy and probably already known, however we include a proof for the convenience of the reader."
A possible solution is writing before your lemma a sentence like the following: "The following result is easy and probably already known, however we include a proof for convenience of the reader."