B, Sury
(2013)
Set theory revisited as easy as pie
the principle of inclusion and exclusion – part 1.
At Right Angles, 2 (1).
pp. 16-19.
ISSN 2582-1873
Abstract
Recall the old story of two frogs from Osaka and Kyoto which meet during
their travels. They want to share a pie. An opportunistic cat offers to help and
divides the pie into two pieces. On finding one piece to be larger, she breaks
off a bit from the larger one and gobbles it up. Now, she finds that the other
piece is slightly larger; so, she proceeds to break off a bit from that piece and
gobbles that up, only to find that the first piece is now bigger. And so on; you
can guess the rest. The frogs are left flat!
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