The Laws of Thought (1854)

a₁ algebraic application assume bability cause chapter coefficients combination compound event conception conclusion connexion consists constituents deduce definition denoted determine disjunctive proposition elements elimination equal events whose probabilities exist expression factor fundamental Hence hypothesis implied indefinite independent inference interpretation involved law of duality laws of thought limited in supply logical equation logical symbols logical value method minor limit natural evils nature necessary object observed occur P₁ particular phænomenon premises present preventive of pain primary propositions principle Prob problem processes productive of pleasure Prop quantity question reasoning reduced reference relation represent respect result satisfy second member secondary propositions simple events solution supposed syllogism system of equations t₁ theory of probabilities things tion treatise true truth universe universe of discourse V₁ vanish whence X is true x-factor x₁ καὶ