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Proof By Previous Result

Student 1: "That last proof was difficult, right?" Student 2: "Not really. It was like three lines." S1: "Only three!? Mine took a whole page! What technique did you use." S2: "'Proof by quoting a previous result.'"

“To prove this statement, I invoke Theorem 3.2 of our textbook in conjunction with Corollary 67.1, which together implies our result trivially.”