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At: fun enumer 1 2 1 2 2 1 2
1. n:
2. m:
3. 0 < m
4. f: ((m-1)n)(nm-1)
5. Bij((m-1)n; (nm-1); f)
6. n = 0
7. f1: n(nm-1)(n(nm-1))
8. Bij(n(nm-1); (n(nm-1)); f1)
9. n(nm-1) = (nm)

f:((mn)(nm)). Bij(mn; (nm); f)
By:
HypSubst 9 7
THEN
Thin 9
Generated subgoal:

17. f1: n(nm-1)(nm)
8. Bij(n(nm-1); (n(nm-1)); f1)
f:((mn)(nm)). Bij(mn; (nm); f)

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existsfunctionnatural_numberintless_than
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