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On the sign:
WESTMINSTER CITY COUNCIL PHILOSOPHER PROFESSOR SIR ALFRED AYER 1910 - 1989 LIVED HERE 1980 - 1989
The sign is on the wall of the house where the philosopher Alfred Jules Eyre (A. J. Ayer) lived, one of the pioneers of logical positivism (philosophy based on the senses and experiments), in English-speaking countries.