(1) No one, who is going to a party, ever fails to brush his hair;
(2) No one looks fascinating, if he is untidy;
(3) Opium-eaters have no self-command;
(4) Every one, who has brushed his hair, looks fascinating;
(5) No one wears white kid gloves, unless he is going to a party;
(6) A man is always untidy, if he has no self-command.
Univ. “persons”; a = going to a party; b = having brushed one’s hair; c = having self-command; d = looking fascinating; e = opium-eaters; h = tidy; k = wearing white kid gloves.
Sets of Concrete Propositions, proposed as Premisses for Soriteses: Conclusions to be found
Lewis Carroll: Symbolic Logic, 1896
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What Is Mathematics? is a mathematics book written by Richard Courant and Herbert Robbins, published in England by Oxford University Press. First published in 1941, it discusses number theory, geometry, topology and calculus. The composer György Ligeti named What Is Mathematics as one of his favourite books.