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==History==
The importance of the concept of form to logic was already recognized in ancient times. [[Aristotle]], in the ''[[Prior Analytics]]'', was probably the first to employ variable letters to represent valid inferences. Therefore, [[Jan Łukasiewicz|Łukasiewicz]] claims that the introduction of variables was 'one of Aristotle's greatest inventions'.
According to the followers of Aristotle like [[Ammonius Hermiae|Ammonius]], only the logical principles stated in schematic terms belong to logic, and not those given in concrete terms. The concrete terms ''man'', ''mortal'', etc., are analogous to the substitution values of the schematic placeholders 'A', 'B', 'C', which were called the 'matter' (Greek ''hyle'', Latin ''materia'') of the argument.
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