Proof of Theorem ltapi
| Step | Hyp | Ref
| Expression |
| 1 | | ltapi.2 |
. 2
⊢ B
∈ V |
| 2 | | dmaddpi 3812 |
. 2
⊢ dom +N =
(N × N) |
| 3 | | ltapi.1 |
. 2
⊢ A
∈ V |
| 4 | | ltrelpi 3811 |
. 2
⊢ <N ⊆
(N × N) |
| 5 | | 0npi 3804 |
. 2
⊢ ¬ ∅ ∈
N |
| 6 | | nnaord 3177 |
. . . . . 6
⊢ ((A
∈ ω ∧ B ∈ ω ∧
C ∈ ω) → (A ∈ B
↔ (C +o A) ∈ (C
+o B))) |
| 7 | | pinn 3800 |
. . . . . 6
⊢ (A
∈ N → A ∈
ω) |
| 8 | | pinn 3800 |
. . . . . 6
⊢ (B
∈ N → B ∈
ω) |
| 9 | | pinn 3800 |
. . . . . 6
⊢ (C
∈ N → C ∈
ω) |
| 10 | 6, 7, 8, 9 | syl3an 628 |
. . . . 5
⊢ ((A
∈ N ∧ B ∈
N ∧ C ∈
N) → (A ∈ B ↔ (C
+o A) ∈ (C +o B))) |
| 11 | 10 | 3expa 612 |
. . . 4
⊢ (((A
∈ N ∧ B ∈
N) ∧ C ∈
N) → (A ∈ B ↔ (C
+o A) ∈ (C +o B))) |
| 12 | | ltpiord 3809 |
. . . . 5
⊢ ((A
∈ N ∧ B ∈
N) → (A
<N B ↔
A ∈ B)) |
| 13 | 12 | adantr 306 |
. . . 4
⊢ (((A
∈ N ∧ B ∈
N) ∧ C ∈
N) → (A
<N B ↔
A ∈ B)) |
| 14 | | ltpiord 3809 |
. . . . . . . 8
⊢ (((C
+N A) ∈
N ∧ (C
+N B) ∈
N) → ((C
+N A)
<N (C
+N B) ↔
(C +N A) ∈ (C
+N B))) |
| 15 | | addclpi 3814 |
. . . . . . . 8
⊢ ((C
∈ N ∧ A ∈
N) → (C
+N A) ∈
N) |
| 16 | | addclpi 3814 |
. . . . . . . 8
⊢ ((C
∈ N ∧ B ∈
N) → (C
+N B) ∈
N) |
| 17 | 14, 15, 16 | syl2an 349 |
. . . . . . 7
⊢ (((C
∈ N ∧ A ∈
N) ∧ (C ∈
N ∧ B ∈
N)) → ((C
+N A)
<N (C
+N B) ↔
(C +N A) ∈ (C
+N B))) |
| 18 | | addpiord 3806 |
. . . . . . . . 9
⊢ ((C
∈ N ∧ A ∈
N) → (C
+N A) = (C +o A)) |
| 19 | 18 | adantr 306 |
. . . . . . . 8
⊢ (((C
∈ N ∧ A ∈
N) ∧ (C ∈
N ∧ B ∈
N)) → (C
+N A) = (C +o A)) |
| 20 | | addpiord 3806 |
. . . . . . . . 9
⊢ ((C
∈ N ∧ B ∈
N) → (C
+N B) = (C +o B)) |
| 21 | 20 | adantl 305 |
. . . . . . . 8
⊢ (((C
∈ N ∧ A ∈
N) ∧ (C ∈
N ∧ B ∈
N)) → (C
+N B) = (C +o B)) |
| 22 | 19, 21 | eleq12d 1157 |
. . . . . . 7
⊢ (((C
∈ N ∧ A ∈
N) ∧ (C ∈
N ∧ B ∈
N)) → ((C
+N A) ∈
(C +N B) ↔ (C
+o A) ∈ (C +o B))) |
| 23 | 17, 22 | bitrd 406 |
. . . . . 6
⊢ (((C
∈ N ∧ A ∈
N) ∧ (C ∈
N ∧ B ∈
N)) → ((C
+N A)
<N (C
+N B) ↔
(C +o A) ∈ (C
+o B))) |
| 24 | 23 | anandis 394 |
. . . . 5
⊢ ((C
∈ N ∧ (A ∈
N ∧ B ∈
N)) → ((C
+N A)
<N (C
+N B) ↔
(C +o A) ∈ (C
+o B))) |
| 25 | 24 | ancoms 334 |
. . . 4
⊢ (((A
∈ N ∧ B ∈
N) ∧ C ∈
N) → ((C
+N A)
<N (C
+N B) ↔
(C +o A) ∈ (C
+o B))) |
| 26 | 11, 13, 25 | 3bitr4d 424 |
. . 3
⊢ (((A
∈ N ∧ B ∈
N) ∧ C ∈
N) → (A
<N B ↔
(C +N A) <N (C +N B))) |
| 27 | 26 | 3impa 609 |
. 2
⊢ ((A
∈ N ∧ B ∈
N ∧ C ∈
N) → (A
<N B ↔
(C +N A) <N (C +N B))) |
| 28 | 1, 2, 3, 4, 5, 27 | ndmord 3064 |
1
⊢ (C
∈ N → (A
<N B ↔
(C +N A) <N (C +N B))) |