Description: Lemma 7 for 2wlkd . (Contributed by AV, 14-Feb-2021)
Ref | Expression | ||
---|---|---|---|
Hypotheses | 2wlkd.p | ⊢ 𝑃 = 〈“ 𝐴 𝐵 𝐶 ”〉 | |
2wlkd.f | ⊢ 𝐹 = 〈“ 𝐽 𝐾 ”〉 | ||
2wlkd.s | ⊢ ( 𝜑 → ( 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉 ) ) | ||
2wlkd.n | ⊢ ( 𝜑 → ( 𝐴 ≠ 𝐵 ∧ 𝐵 ≠ 𝐶 ) ) | ||
2wlkd.e | ⊢ ( 𝜑 → ( { 𝐴 , 𝐵 } ⊆ ( 𝐼 ‘ 𝐽 ) ∧ { 𝐵 , 𝐶 } ⊆ ( 𝐼 ‘ 𝐾 ) ) ) | ||
Assertion | 2wlkdlem7 | ⊢ ( 𝜑 → ( 𝐽 ∈ V ∧ 𝐾 ∈ V ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2wlkd.p | ⊢ 𝑃 = 〈“ 𝐴 𝐵 𝐶 ”〉 | |
2 | 2wlkd.f | ⊢ 𝐹 = 〈“ 𝐽 𝐾 ”〉 | |
3 | 2wlkd.s | ⊢ ( 𝜑 → ( 𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑉 ∧ 𝐶 ∈ 𝑉 ) ) | |
4 | 2wlkd.n | ⊢ ( 𝜑 → ( 𝐴 ≠ 𝐵 ∧ 𝐵 ≠ 𝐶 ) ) | |
5 | 2wlkd.e | ⊢ ( 𝜑 → ( { 𝐴 , 𝐵 } ⊆ ( 𝐼 ‘ 𝐽 ) ∧ { 𝐵 , 𝐶 } ⊆ ( 𝐼 ‘ 𝐾 ) ) ) | |
6 | 1 2 3 4 5 | 2wlkdlem6 | ⊢ ( 𝜑 → ( 𝐵 ∈ ( 𝐼 ‘ 𝐽 ) ∧ 𝐵 ∈ ( 𝐼 ‘ 𝐾 ) ) ) |
7 | elfvex | ⊢ ( 𝐵 ∈ ( 𝐼 ‘ 𝐽 ) → 𝐽 ∈ V ) | |
8 | elfvex | ⊢ ( 𝐵 ∈ ( 𝐼 ‘ 𝐾 ) → 𝐾 ∈ V ) | |
9 | 7 8 | anim12i | ⊢ ( ( 𝐵 ∈ ( 𝐼 ‘ 𝐽 ) ∧ 𝐵 ∈ ( 𝐼 ‘ 𝐾 ) ) → ( 𝐽 ∈ V ∧ 𝐾 ∈ V ) ) |
10 | 6 9 | syl | ⊢ ( 𝜑 → ( 𝐽 ∈ V ∧ 𝐾 ∈ V ) ) |