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- 21)
- 1-∀x (A(x)^B(x)) ├─∀xA(x)^∀xB(x)
- 2- [¬(\/xA(x)^\/xB(x))]
- 2.1- ¬\/xA(x) v ¬\/xB(x) regra1(2)
- 2.2- A(a)^B(a) E\/(1) x/a
- 2.3- A(a) E^(2.2)
- 2.4- B(a) E^(2.2)
- 2.5- [¬\/xA(x)]
- 2.5.1- ¬A(a) E\/(2.5) x/a
- 2.5.2- _|_ ABS(2.3, 2.5.1)
- 2.6-[¬\/xB(x)]
- 2.6.1- ¬B(a) E\/(2.5) x/a
- 2.6.2- _|_ ABS(2.4, 2.6.1)
- 2.7- _|_ Ev(2.1, 2.5, 2.6)
- 3- \/xA(x) ^ \/xB(x) RA(2, 2.7)
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