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will sometimes assure us of this. But, generally speaking, it may be necessary to draw distinct schemara to represent alternative possibilities. Theorematic reasoning invariably depends upon experimentation with individual schemata. We shall find that, in the last analysis, the same thing is true of the corollarial reasoning, too; even the Aristotelian "demonstration why." Only, in this case, tho very words serve as schemata. Accordingly, we may say that corollarial, or "philosophical", reasoning with words; while theorematic, or mathematical reasoning proper, is reasoning with specially constructed schemata.
Another characteristic of mathematical thought it the extraordinary use it makes of abstractions. Abstractions have been a favorite butt of ridicule in modern times. Now it is very easy to laugh at the old physician who is represented answering the
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