Tractatus Logico-Philosophicus (1922) - Page 24


3.26	A name cannot be dissected any further by means of a definition: it is a primitive sign original: "Urzeichen".
3.261	Every sign that has a definition signifies via the signs that serve to define it; and the definitions point the way.
	Two signs cannot signify in the same manner if one is a primitive sign and the other is defined by means of primitive signs. Names cannot be anatomized by means of definitions. (Nor can any sign that has a meaning independently and on its own.)
3.262	What signs fail to express, their application shows. What signs slur over, their application says clearly.
3.263	The meanings of primitive signs can be explained by elucidations. Elucidations are propositions that contain the primitive signs. So they can only be understood if the meanings of those signs are already known.
3.3	Only propositions have sense; only in the nexus of a proposition does a name have meaning.
3.31	I call any part of a proposition that characterizes its sense an expression (or a symbol).
	(A proposition is itself an expression.)
	Everything essential to their sense that propositions can have in common with one another is an expression.
	An expression is the mark of a form and