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?Published online by Cambridge University Press: 17 October 2016
Here we present a simplification of one of the standard proofs that
. We then look at extensions of the new approach, and add comments on the nature of the simplification (which relates to Step 1 below) and finally on the literature.
As in most proofs of the result, we shall actually prove that
; because
this is equivalent to the result sought.
, Amer. Math. Monthly
80 (1973) pp. 424–425.Google Scholar