Proof of Theorem hlimunii
| Step | Hyp | Ref
| Expression |
| 1 | | nn2get 4438 |
. . . . 5
⊢ ((y
∈ ℕ ∧ w ∈ ℕ)
→ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 2 | 1 | rgen2 1248 |
. . . 4
⊢ ∀y ∈ ℕ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z) |
| 3 | | hlimunii.3 |
. . . . . . . . . 10
⊢ (F
⇝v A ∧ F ⇝v B) |
| 4 | 3 | pm3.26i 257 |
. . . . . . . . 9
⊢ F
⇝v A |
| 5 | | hlimuni.3 |
. . . . . . . . . 10
⊢ F
∈ V |
| 6 | | hlimuni.1 |
. . . . . . . . . 10
⊢ A
∈ V |
| 7 | 5, 6 | hlimvec 5110 |
. . . . . . . . 9
⊢ (F
⇝v A →
A ∈ ℋ ) |
| 8 | 4, 7 | ax-mp 6 |
. . . . . . . 8
⊢ A
∈ ℋ |
| 9 | 3 | pm3.27i 261 |
. . . . . . . . 9
⊢ F
⇝v B |
| 10 | | hlimuni.2 |
. . . . . . . . . 10
⊢ B
∈ V |
| 11 | 5, 10 | hlimvec 5110 |
. . . . . . . . 9
⊢ (F
⇝v B →
B ∈ ℋ ) |
| 12 | 9, 11 | ax-mp 6 |
. . . . . . . 8
⊢ B
∈ ℋ |
| 13 | 8, 12 | hvsubcl 5002 |
. . . . . . 7
⊢ (A
−v B) ∈
ℋ |
| 14 | 13 | normcl 5081 |
. . . . . 6
⊢ (norm ‘(A −v B)) ∈ ℝ |
| 15 | | 2re 4470 |
. . . . . 6
⊢ 2 ∈ ℝ |
| 16 | | 2pos 4479 |
. . . . . 6
⊢ 0 < 2 |
| 17 | 14, 15, 16 | divgt0lem 4389 |
. . . . 5
⊢ (0 < (norm ‘(A −v B)) → 0 < ((norm ‘(A −v B)) / 2)) |
| 18 | 5, 6 | hlimconv 5111 |
. . . . . . . 8
⊢ (F
⇝v A →
∀x ∈ ℝ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x))) |
| 19 | 4, 18 | ax-mp 6 |
. . . . . . 7
⊢ ∀x ∈ ℝ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x)) |
| 20 | 15, 16 | gt0ne0i 4345 |
. . . . . . . 8
⊢ 2 ≠ 0 |
| 21 | 14, 15, 20 | redivcl 4274 |
. . . . . . 7
⊢ ((norm ‘(A −v B)) / 2) ∈ ℝ |
| 22 | | breq2 2066 |
. . . . . . . . 9
⊢ (x =
((norm ‘(A −v
B)) / 2) → (0 < x ↔ 0 < ((norm ‘(A −v B)) / 2))) |
| 23 | | breq2 2066 |
. . . . . . . . . . . 12
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((norm ‘((F ‘z)
−v A)) <
x ↔ (norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2))) |
| 24 | 23 | imbi2d 464 |
. . . . . . . . . . 11
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((y ≤ z →
(norm ‘((F ‘z) −v A)) < x)
↔ (y ≤ z → (norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2)))) |
| 25 | 24 | biraldv 1219 |
. . . . . . . . . 10
⊢ (x =
((norm ‘(A −v
B)) / 2) → (∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x)
↔ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)))) |
| 26 | 25 | birexdv 1220 |
. . . . . . . . 9
⊢ (x =
((norm ‘(A −v
B)) / 2) → (∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x)
↔ ∃y ∈ ℕ
∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)))) |
| 27 | 22, 26 | imbi12d 474 |
. . . . . . . 8
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x))
↔ (0 < ((norm ‘(A
−v B)) / 2) →
∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2))))) |
| 28 | 27 | rcla4v 1402 |
. . . . . . 7
⊢ (∀x ∈ ℝ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < x))
→ (((norm ‘(A
−v B)) / 2) ∈
ℝ → (0 < ((norm ‘(A
−v B)) / 2) →
∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2))))) |
| 29 | 19, 21, 28 | mp2 43 |
. . . . . 6
⊢ (0 < ((norm ‘(A −v B)) / 2) → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2))) |
| 30 | 5, 10 | hlimconv 5111 |
. . . . . . . 8
⊢ (F
⇝v B →
∀x ∈ ℝ (0 < x → ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x))) |
| 31 | 9, 30 | ax-mp 6 |
. . . . . . 7
⊢ ∀x ∈ ℝ (0 < x → ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x)) |
| 32 | | breq2 2066 |
. . . . . . . . . . . 12
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((norm ‘((F ‘z)
−v B)) <
x ↔ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2))) |
| 33 | 32 | imbi2d 464 |
. . . . . . . . . . 11
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((w ≤ z →
(norm ‘((F ‘z) −v B)) < x)
↔ (w ≤ z → (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)))) |
| 34 | 33 | biraldv 1219 |
. . . . . . . . . 10
⊢ (x =
((norm ‘(A −v
B)) / 2) → (∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x)
↔ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 35 | 34 | birexdv 1220 |
. . . . . . . . 9
⊢ (x =
((norm ‘(A −v
B)) / 2) → (∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x)
↔ ∃w ∈ ℕ
∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 36 | 22, 35 | imbi12d 474 |
. . . . . . . 8
⊢ (x =
((norm ‘(A −v
B)) / 2) → ((0 < x → ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x))
↔ (0 < ((norm ‘(A
−v B)) / 2) →
∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))))) |
| 37 | 36 | rcla4v 1402 |
. . . . . . 7
⊢ (∀x ∈ ℝ (0 < x → ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < x))
→ (((norm ‘(A
−v B)) / 2) ∈
ℝ → (0 < ((norm ‘(A
−v B)) / 2) →
∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))))) |
| 38 | 31, 21, 37 | mp2 43 |
. . . . . 6
⊢ (0 < ((norm ‘(A −v B)) / 2) → ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) |
| 39 | 29, 38 | jca 236 |
. . . . 5
⊢ (0 < ((norm ‘(A −v B)) / 2) → (∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 40 | | r19.26 1289 |
. . . . . . . . 9
⊢ (∀z ∈ ℕ ((y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) ↔ (∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 41 | 14 | ltnr 4338 |
. . . . . . . . . . . . 13
⊢ ¬ (norm ‘(A −v B)) < (norm ‘(A −v B)) |
| 42 | 5, 6 | hlimseq 5109 |
. . . . . . . . . . . . . . . . . . 19
⊢ (F
⇝v A →
F:ℕ–→ ℋ ) |
| 43 | 4, 42 | ax-mp 6 |
. . . . . . . . . . . . . . . . . 18
⊢ F:ℕ–→ ℋ |
| 44 | | ffvrn 2890 |
. . . . . . . . . . . . . . . . . 18
⊢ ((F:ℕ–→ ℋ ∧ z ∈ ℕ) → (F ‘z)
∈ ℋ ) |
| 45 | 43, 44 | mpan 518 |
. . . . . . . . . . . . . . . . 17
⊢ (z
∈ ℕ → (F ‘z) ∈ ℋ ) |
| 46 | | normsubt 5091 |
. . . . . . . . . . . . . . . . . 18
⊢ (((F
‘z) ∈ ℋ ∧ A ∈ ℋ ) → (norm ‘((F ‘z)
−v A)) = (norm
‘(A −v
(F ‘z)))) |
| 47 | 8, 46 | mpan2 519 |
. . . . . . . . . . . . . . . . 17
⊢ ((F
‘z) ∈ ℋ → (norm
‘((F ‘z) −v A)) = (norm ‘(A −v (F ‘z)))) |
| 48 | 45, 47 | syl 12 |
. . . . . . . . . . . . . . . 16
⊢ (z
∈ ℕ → (norm ‘((F
‘z) −v
A)) = (norm ‘(A −v (F ‘z)))) |
| 49 | 48 | breq1d 2071 |
. . . . . . . . . . . . . . 15
⊢ (z
∈ ℕ → ((norm ‘((F
‘z) −v
A)) < ((norm ‘(A −v B)) / 2) ↔ (norm ‘(A −v (F ‘z)))
< ((norm ‘(A
−v B)) /
2))) |
| 50 | 49 | anbi1d 469 |
. . . . . . . . . . . . . 14
⊢ (z
∈ ℕ → (((norm ‘((F
‘z) −v
A)) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) ↔ ((norm ‘(A −v (F ‘z)))
< ((norm ‘(A
−v B)) / 2) ∧
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 51 | 8, 12 | pm3.2i 234 |
. . . . . . . . . . . . . . . . 17
⊢ (A
∈ ℋ ∧ B ∈ ℋ
) |
| 52 | | norm3lemt 5097 |
. . . . . . . . . . . . . . . . 17
⊢ (((A
∈ ℋ ∧ B ∈ ℋ )
∧ ((F ‘z) ∈ ℋ ∧ (norm ‘(A −v B)) ∈ ℝ)) → (((norm ‘(A −v (F ‘z)))
< ((norm ‘(A
−v B)) / 2) ∧
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)) → (norm ‘(A −v B)) < (norm ‘(A −v B)))) |
| 53 | 51, 52 | mpan 518 |
. . . . . . . . . . . . . . . 16
⊢ (((F
‘z) ∈ ℋ ∧ (norm
‘(A −v
B)) ∈ ℝ) → (((norm
‘(A −v
(F ‘z))) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → (norm ‘(A −v B)) < (norm ‘(A −v B)))) |
| 54 | 14, 53 | mpan2 519 |
. . . . . . . . . . . . . . 15
⊢ ((F
‘z) ∈ ℋ → (((norm
‘(A −v
(F ‘z))) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → (norm ‘(A −v B)) < (norm ‘(A −v B)))) |
| 55 | 45, 54 | syl 12 |
. . . . . . . . . . . . . 14
⊢ (z
∈ ℕ → (((norm ‘(A
−v (F
‘z))) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → (norm ‘(A −v B)) < (norm ‘(A −v B)))) |
| 56 | 50, 55 | sylbid 178 |
. . . . . . . . . . . . 13
⊢ (z
∈ ℕ → (((norm ‘((F
‘z) −v
A)) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → (norm ‘(A −v B)) < (norm ‘(A −v B)))) |
| 57 | 41, 56 | mtoi 94 |
. . . . . . . . . . . 12
⊢ (z
∈ ℕ → ¬ ((norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2))) |
| 58 | | con3 86 |
. . . . . . . . . . . . 13
⊢ (((y
≤ z ∧ w ≤ z) →
((norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2))) → (¬ ((norm
‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → ¬ (y ≤ z ∧
w ≤ z))) |
| 59 | 58 | com12 13 |
. . . . . . . . . . . 12
⊢ (¬ ((norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)) → (((y ≤ z ∧
w ≤ z) → ((norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2))) → ¬ (y ≤ z ∧
w ≤ z))) |
| 60 | 57, 59 | syl 12 |
. . . . . . . . . . 11
⊢ (z
∈ ℕ → (((y ≤ z ∧ w ≤
z) → ((norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2))) → ¬ (y ≤ z ∧
w ≤ z))) |
| 61 | | prth 429 |
. . . . . . . . . . 11
⊢ (((y
≤ z → (norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2)) ∧ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ((y ≤ z ∧
w ≤ z) → ((norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2) ∧ (norm ‘((F ‘z)
−v B)) < ((norm
‘(A −v
B)) / 2)))) |
| 62 | 60, 61 | syl5 22 |
. . . . . . . . . 10
⊢ (z
∈ ℕ → (((y ≤ z → (norm ‘((F ‘z)
−v A)) < ((norm
‘(A −v
B)) / 2)) ∧ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ¬ (y ≤ z ∧
w ≤ z))) |
| 63 | 62 | r19.20i 1253 |
. . . . . . . . 9
⊢ (∀z ∈ ℕ ((y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z)) |
| 64 | 40, 63 | sylbir 176 |
. . . . . . . 8
⊢ ((∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z)) |
| 65 | 64 | r19.22si 1275 |
. . . . . . 7
⊢ (∃w ∈ ℕ (∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z)) |
| 66 | 65 | r19.22si 1275 |
. . . . . 6
⊢ (∃y ∈ ℕ ∃w ∈ ℕ (∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ∃y ∈ ℕ ∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z)) |
| 67 | | reeanv 1316 |
. . . . . 6
⊢ (∃y ∈ ℕ ∃w ∈ ℕ (∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) ↔ (∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2)))) |
| 68 | | ralnex 1209 |
. . . . . . . . . 10
⊢ (∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z) ↔ ¬ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 69 | 68 | birex 1224 |
. . . . . . . . 9
⊢ (∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z) ↔ ∃w ∈ ℕ ¬ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 70 | | rexnal 1210 |
. . . . . . . . 9
⊢ (∃w ∈ ℕ ¬ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z) ↔ ¬ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 71 | 69, 70 | bitr 151 |
. . . . . . . 8
⊢ (∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z) ↔ ¬ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 72 | 71 | birex 1224 |
. . . . . . 7
⊢ (∃y ∈ ℕ ∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z) ↔ ∃y ∈ ℕ ¬ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 73 | | rexnal 1210 |
. . . . . . 7
⊢ (∃y ∈ ℕ ¬ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z) ↔ ¬ ∀y ∈ ℕ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 74 | 72, 73 | bitr 151 |
. . . . . 6
⊢ (∃y ∈ ℕ ∃w ∈ ℕ ∀z ∈ ℕ ¬ (y ≤ z ∧
w ≤ z) ↔ ¬ ∀y ∈ ℕ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 75 | 66, 67, 74 | 3imtr3 191 |
. . . . 5
⊢ ((∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(norm ‘((F ‘z) −v A)) < ((norm ‘(A −v B)) / 2)) ∧ ∃w ∈ ℕ ∀z ∈ ℕ (w ≤ z →
(norm ‘((F ‘z) −v B)) < ((norm ‘(A −v B)) / 2))) → ¬ ∀y ∈ ℕ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 76 | 17, 39, 75 | 3syl 21 |
. . . 4
⊢ (0 < (norm ‘(A −v B)) → ¬ ∀y ∈ ℕ ∀w ∈ ℕ ∃z ∈ ℕ (y ≤ z ∧
w ≤ z)) |
| 77 | 2, 76 | mt2 96 |
. . 3
⊢ ¬ 0 < (norm ‘(A −v B)) |
| 78 | | normgt0t 5078 |
. . . . 5
⊢ ((A
−v B) ∈
ℋ → (¬ (A
−v B) =
0v ↔ 0 < (norm ‘(A −v B)))) |
| 79 | 13, 78 | ax-mp 6 |
. . . 4
⊢ (¬ (A −v B) = 0v ↔ 0 < (norm
‘(A −v
B))) |
| 80 | 79 | bicon1i 193 |
. . 3
⊢ (¬ 0 < (norm ‘(A −v B)) ↔ (A
−v B) =
0v) |
| 81 | 77, 80 | mpbi 164 |
. 2
⊢ (A
−v B) =
0v |
| 82 | 8, 12 | hvsubeq0 5035 |
. 2
⊢ ((A
−v B) =
0v ↔ A = B) |
| 83 | 81, 82 | mpbi 164 |
1
⊢ A =
B |