Bertrand Russell Vagueness articleVaguenessBertrand RussellAustralasian Journal of Psychology and Philosophy, vol. 1, no. 2, 1923, pp. 84--92Quotes from this workThe law of excluded middle is true when precise symbols are employed, but it is not true when symbols are vague, as, in fact, all symbols are.Excluded Middle · Vaguenesspp. 84-92