Proof of Theorem uz11
| Step | Hyp | Ref | Expression | 
|---|
| 1 |  | uzid 12894 | . . . . 5
⊢ (𝑀 ∈ ℤ → 𝑀 ∈
(ℤ≥‘𝑀)) | 
| 2 |  | eleq2 2829 | . . . . . 6
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑀 ∈ (ℤ≥‘𝑀) ↔ 𝑀 ∈ (ℤ≥‘𝑁))) | 
| 3 |  | eluzel2 12884 | . . . . . 6
⊢ (𝑀 ∈
(ℤ≥‘𝑁) → 𝑁 ∈ ℤ) | 
| 4 | 2, 3 | biimtrdi 253 | . . . . 5
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑀 ∈ (ℤ≥‘𝑀) → 𝑁 ∈ ℤ)) | 
| 5 | 1, 4 | mpan9 506 | . . . 4
⊢ ((𝑀 ∈ ℤ ∧
(ℤ≥‘𝑀) = (ℤ≥‘𝑁)) → 𝑁 ∈ ℤ) | 
| 6 |  | uzid 12894 | . . . . . . . . . . 11
⊢ (𝑁 ∈ ℤ → 𝑁 ∈
(ℤ≥‘𝑁)) | 
| 7 |  | eleq2 2829 | . . . . . . . . . . 11
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑁 ∈ (ℤ≥‘𝑀) ↔ 𝑁 ∈ (ℤ≥‘𝑁))) | 
| 8 | 6, 7 | imbitrrid 246 | . . . . . . . . . 10
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑁 ∈ ℤ → 𝑁 ∈ (ℤ≥‘𝑀))) | 
| 9 |  | eluzle 12892 | . . . . . . . . . 10
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 ≤ 𝑁) | 
| 10 | 8, 9 | syl6 35 | . . . . . . . . 9
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑁 ∈ ℤ → 𝑀 ≤ 𝑁)) | 
| 11 | 1, 2 | imbitrid 244 | . . . . . . . . . 10
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑀 ∈ ℤ → 𝑀 ∈ (ℤ≥‘𝑁))) | 
| 12 |  | eluzle 12892 | . . . . . . . . . 10
⊢ (𝑀 ∈
(ℤ≥‘𝑁) → 𝑁 ≤ 𝑀) | 
| 13 | 11, 12 | syl6 35 | . . . . . . . . 9
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → (𝑀 ∈ ℤ → 𝑁 ≤ 𝑀)) | 
| 14 | 10, 13 | anim12d 609 | . . . . . . . 8
⊢
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀))) | 
| 15 | 14 | impl 455 | . . . . . . 7
⊢
((((ℤ≥‘𝑀) = (ℤ≥‘𝑁) ∧ 𝑁 ∈ ℤ) ∧ 𝑀 ∈ ℤ) → (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀)) | 
| 16 | 15 | ancoms 458 | . . . . . 6
⊢ ((𝑀 ∈ ℤ ∧
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) ∧ 𝑁 ∈ ℤ)) → (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀)) | 
| 17 | 16 | anassrs 467 | . . . . 5
⊢ (((𝑀 ∈ ℤ ∧
(ℤ≥‘𝑀) = (ℤ≥‘𝑁)) ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀)) | 
| 18 |  | zre 12619 | . . . . . . 7
⊢ (𝑀 ∈ ℤ → 𝑀 ∈
ℝ) | 
| 19 |  | zre 12619 | . . . . . . 7
⊢ (𝑁 ∈ ℤ → 𝑁 ∈
ℝ) | 
| 20 |  | letri3 11347 | . . . . . . 7
⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (𝑀 = 𝑁 ↔ (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀))) | 
| 21 | 18, 19, 20 | syl2an 596 | . . . . . 6
⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 = 𝑁 ↔ (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀))) | 
| 22 | 21 | adantlr 715 | . . . . 5
⊢ (((𝑀 ∈ ℤ ∧
(ℤ≥‘𝑀) = (ℤ≥‘𝑁)) ∧ 𝑁 ∈ ℤ) → (𝑀 = 𝑁 ↔ (𝑀 ≤ 𝑁 ∧ 𝑁 ≤ 𝑀))) | 
| 23 | 17, 22 | mpbird 257 | . . . 4
⊢ (((𝑀 ∈ ℤ ∧
(ℤ≥‘𝑀) = (ℤ≥‘𝑁)) ∧ 𝑁 ∈ ℤ) → 𝑀 = 𝑁) | 
| 24 | 5, 23 | mpdan 687 | . . 3
⊢ ((𝑀 ∈ ℤ ∧
(ℤ≥‘𝑀) = (ℤ≥‘𝑁)) → 𝑀 = 𝑁) | 
| 25 | 24 | ex 412 | . 2
⊢ (𝑀 ∈ ℤ →
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) → 𝑀 = 𝑁)) | 
| 26 |  | fveq2 6905 | . 2
⊢ (𝑀 = 𝑁 → (ℤ≥‘𝑀) =
(ℤ≥‘𝑁)) | 
| 27 | 25, 26 | impbid1 225 | 1
⊢ (𝑀 ∈ ℤ →
((ℤ≥‘𝑀) = (ℤ≥‘𝑁) ↔ 𝑀 = 𝑁)) |