Proof of Theorem hvadd4t
| Step | Hyp | Ref
| Expression |
| 1 | | hvadd23t 5011 |
. . . . 5
⊢ ((A
∈ ℋ ∧ B ∈ ℋ ∧
C ∈ ℋ ) → ((A +v B) +v C) = ((A
+v C)
+v B)) |
| 2 | 1 | opreq1d 3012 |
. . . 4
⊢ ((A
∈ ℋ ∧ B ∈ ℋ ∧
C ∈ ℋ ) → (((A +v B) +v C) +v D) = (((A
+v C)
+v B)
+v D)) |
| 3 | 2 | 3expa 612 |
. . 3
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ C ∈ ℋ ) → (((A +v B) +v C) +v D) = (((A
+v C)
+v B)
+v D)) |
| 4 | 3 | adantrr 312 |
. 2
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ (C ∈ ℋ ∧ D ∈ ℋ )) → (((A +v B) +v C) +v D) = (((A
+v C)
+v B)
+v D)) |
| 5 | | ax-hvass 4986 |
. . . 4
⊢ (((A
+v B) ∈ ℋ
∧ C ∈ ℋ ∧ D ∈ ℋ ) → (((A +v B) +v C) +v D) = ((A
+v B)
+v (C
+v D))) |
| 6 | 5 | 3expb 613 |
. . 3
⊢ (((A
+v B) ∈ ℋ
∧ (C ∈ ℋ ∧ D ∈ ℋ )) → (((A +v B) +v C) +v D) = ((A
+v B)
+v (C
+v D))) |
| 7 | | ax-hvaddcl 4984 |
. . 3
⊢ ((A
∈ ℋ ∧ B ∈ ℋ )
→ (A +v B) ∈ ℋ ) |
| 8 | 6, 7 | sylan 343 |
. 2
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ (C ∈ ℋ ∧ D ∈ ℋ )) → (((A +v B) +v C) +v D) = ((A
+v B)
+v (C
+v D))) |
| 9 | | ax-hvass 4986 |
. . . . 5
⊢ (((A
+v C) ∈ ℋ
∧ B ∈ ℋ ∧ D ∈ ℋ ) → (((A +v C) +v B) +v D) = ((A
+v C)
+v (B
+v D))) |
| 10 | 9 | 3expb 613 |
. . . 4
⊢ (((A
+v C) ∈ ℋ
∧ (B ∈ ℋ ∧ D ∈ ℋ )) → (((A +v C) +v B) +v D) = ((A
+v C)
+v (B
+v D))) |
| 11 | | ax-hvaddcl 4984 |
. . . 4
⊢ ((A
∈ ℋ ∧ C ∈ ℋ )
→ (A +v C) ∈ ℋ ) |
| 12 | 10, 11 | sylan 343 |
. . 3
⊢ (((A
∈ ℋ ∧ C ∈ ℋ )
∧ (B ∈ ℋ ∧ D ∈ ℋ )) → (((A +v C) +v B) +v D) = ((A
+v C)
+v (B
+v D))) |
| 13 | 12 | an4s 390 |
. 2
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ (C ∈ ℋ ∧ D ∈ ℋ )) → (((A +v C) +v B) +v D) = ((A
+v C)
+v (B
+v D))) |
| 14 | 4, 8, 13 | 3eqtr3d 1133 |
1
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ (C ∈ ℋ ∧ D ∈ ℋ )) → ((A +v B) +v (C +v D)) = ((A
+v C)
+v (B
+v D))) |