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Argument formThe test form of an argument is what results from replacing different words, or sentences, that make up the argument with letters; the letters are called variables.
Just as variables can stand for various numbers in mathematics, variables can stand for various words, or sentences, in logic. Argument forms are very important in the study of logic. The parts of argument forms--sentence forms (see below)--are equally important. In a logic course one would learn how to determine what the forms of various sentences and arguments are.
The basic notion of argument form can be introduced with an example. Here is an example of an argument:
A All humans are mortal. Socrates is human. Therefore, Socrates is mortal.
We can rewrite argument A by putting each sentence on its own line:
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