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2. Q : Prop 3. f : {u:| P(u) }{v:| Q(v) } 4. Inj({u:| P(u) }; {v:| Q(v) }; f) 5. m : {u:| P(u) } 6. k : {v:| Q(v) } 7. (Replace value k by f(m) in f) {u:| P(u) & u = m }{v:| Q(v) & v = k } Inj({u:| P(u) & u = m }; {v:| Q(v) & v = k }; Inj(Replace value k by f(m) in f) | 10 steps |
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