Inj(
m
n; (n
m); 
z.f1( < z(m-1),f(z) > )) Surj(mn; (nm); z.f1( < z(m-1),f(z) > ))
(m-1)n)(nm-1)(m-1)n; (nm-1); f)
n = 0n
(nm-1)(nm)n(nm-1); (n
(nm-1)); f1) Bij(mn; (nm); z.f1( < z(m-1),f(z) > ))| 1 | Inj(mn; (nm); z.f1( < z(m-1),f(z) > )) |
| 2 | Surj(mn; (nm); z.f1( < z(m-1),f(z) > )) |
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