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|Arend Heyting Ein Streitgespräch 1956 in Kursbuch 8 Mathematik 1967
Finiteness/Heyting: What the finitist denies in intuitionism is the notion that mathematics has something to do with the infinite.
Intuitionism: of course, its extreme finiteness guarantees maximum security. Every student, however, understands the natural numbers and can see that they go on infinitely.
Letter: That he understands it, is suggested to him.
Intuitionism: this is not an objection, because communication with language can always be regarded as a suggestion. Euclid also knew what he was talking about when he proved that the set of prime numbers is infinite._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Intuitionism: An Introduction (Study in Logic & Mathematics) 1971