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101 " the conditions for sense rather than nonsense in combinations of symbols; "
― Ludwig Wittgenstein , Tractatus Logico-Philosophicus
102 " Not how the world is, is the mystical, but that it is. "
103 " The sense of a truth-function of p is a function of the sense of p. Denial, logical addition, logical multiplication, etc. etc., are operations. (Denial reverses the sense of a proposition.) "
104 " Contradiction is the external limit of the propositions, tautology their substanceless centre. "
105 " That ∨, ⊃, etc., are not relations in the sense of right and left, etc., is obvious. "
106 " 1. The world is everything that is the case.2. What is the case (a fact) is the existence of states of affairs.3. A logical picture of facts is a thought.4. A thought is a proposition with a sense.5. A proposition is a truth-function of elementary propositions. (An elementary proposition is a truth-function of itself.)6. The general form of a proposition is the general form of a truth function, which is: [p, E, N(E)]. This is the general form of a proposition.7. Whereof one cannot speak, thereof one must be silent. "
107 " Logic precedes every experience—that something is so. "
108 " The logic of the world which the propositions of logic show in tautologies, mathematics shows in equations. "
109 " Mathematics is a method of logic. "
110 " Logical research means the investigation of all regularity. And outside logic all is accident. "