To Mock a Mocking Bird by Raymond M. Smullyan

Author:Raymond M. Smullyan [Smullyan, Raymond]
Language: eng
Format: epub, mobi
ISBN: 978-0-307-81979-6
Publisher: Knopf Doubleday Publishing Group
Published: 2012-05-15T16:00:00+00:00

5 • The Bird W’

“Show that from B, T, and M you can derive a bird W’ satisfying the following condition:

W’xy = yxx

“We might call W’ a converse warbler,” said Bravura. “Curiously enough, W’ is easier to derive than W. It is particularly simple to derive W’ from B, R, and M. Can you see how?”

6 • The Warbler

“Now that you have W’, it is simple to get W. In fact, W can be derived from B, R, C, and M using an expression of only four letters. Can you see how?”

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