Proof: choose + 1 (the floor function). For every , .
อ้างอิง
Courant, Richard (1961). "Differential and Integral Calculus Volume I", Blackie & Son, Ltd., Glasgow.
Frank Morley and James Harkness A treatise on the theory of functions (New York: Macmillan, 1893)
สิงหาคม 16, 2021
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