Reasonable Logic

able according affairs already appears application arbitrary argument asserts atomic facts becomes belongs brackets clear co-ordination combination common completely connected connexion consists constant constituent constructed contained contradiction corresponds definite denial denied depends described determined elementary propositions elements equal essential everything example existence explained expression external false follows formal concept Frege function give given happen identical impossible independent indicate inference introduce kind language limits logical logical form logical propositions logical space mathematics meaning mechanics method notation objects obvious occur operation philosophy picture position possible present primitive signs priori probability problems properties propositional sign propositions of logic question reality relation represent result rule Russell sense senseless shows signifies simple speak stand structure symbols tautology term theory thing thought tion true truth truth-functions truth-operations truth-possibilities understand values variable whole