| Step | Hyp | Ref
 | Expression | 
| 1 |   | df-nr 7794 | 
. 2
⊢
R = ((P × P) /
~R ) | 
| 2 |   | breq1 4036 | 
. . . 4
⊢
([〈𝑥, 𝑦〉]
~R = 𝑓 → ([〈𝑥, 𝑦〉] ~R
<R [〈𝑧, 𝑤〉] ~R ↔
𝑓
<R [〈𝑧, 𝑤〉] ~R
)) | 
| 3 | 2 | anbi1d 465 | 
. . 3
⊢
([〈𝑥, 𝑦〉]
~R = 𝑓 → (([〈𝑥, 𝑦〉] ~R
<R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) ↔
(𝑓
<R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R
))) | 
| 4 |   | breq1 4036 | 
. . 3
⊢
([〈𝑥, 𝑦〉]
~R = 𝑓 → ([〈𝑥, 𝑦〉] ~R
<R [〈𝑣, 𝑢〉] ~R ↔
𝑓
<R [〈𝑣, 𝑢〉] ~R
)) | 
| 5 | 3, 4 | imbi12d 234 | 
. 2
⊢
([〈𝑥, 𝑦〉]
~R = 𝑓 → ((([〈𝑥, 𝑦〉] ~R
<R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) →
[〈𝑥, 𝑦〉]
~R <R [〈𝑣, 𝑢〉] ~R ) ↔
((𝑓
<R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) →
𝑓
<R [〈𝑣, 𝑢〉] ~R
))) | 
| 6 |   | breq2 4037 | 
. . . 4
⊢
([〈𝑧, 𝑤〉]
~R = 𝑔 → (𝑓 <R [〈𝑧, 𝑤〉] ~R ↔
𝑓
<R 𝑔)) | 
| 7 |   | breq1 4036 | 
. . . 4
⊢
([〈𝑧, 𝑤〉]
~R = 𝑔 → ([〈𝑧, 𝑤〉] ~R
<R [〈𝑣, 𝑢〉] ~R ↔
𝑔
<R [〈𝑣, 𝑢〉] ~R
)) | 
| 8 | 6, 7 | anbi12d 473 | 
. . 3
⊢
([〈𝑧, 𝑤〉]
~R = 𝑔 → ((𝑓 <R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) ↔
(𝑓
<R 𝑔 ∧ 𝑔 <R [〈𝑣, 𝑢〉] ~R
))) | 
| 9 | 8 | imbi1d 231 | 
. 2
⊢
([〈𝑧, 𝑤〉]
~R = 𝑔 → (((𝑓 <R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) →
𝑓
<R [〈𝑣, 𝑢〉] ~R ) ↔
((𝑓
<R 𝑔 ∧ 𝑔 <R [〈𝑣, 𝑢〉] ~R ) →
𝑓
<R [〈𝑣, 𝑢〉] ~R
))) | 
| 10 |   | breq2 4037 | 
. . . 4
⊢
([〈𝑣, 𝑢〉]
~R = ℎ → (𝑔 <R [〈𝑣, 𝑢〉] ~R ↔
𝑔
<R ℎ)) | 
| 11 | 10 | anbi2d 464 | 
. . 3
⊢
([〈𝑣, 𝑢〉]
~R = ℎ → ((𝑓 <R 𝑔 ∧ 𝑔 <R [〈𝑣, 𝑢〉] ~R ) ↔
(𝑓
<R 𝑔 ∧ 𝑔 <R ℎ))) | 
| 12 |   | breq2 4037 | 
. . 3
⊢
([〈𝑣, 𝑢〉]
~R = ℎ → (𝑓 <R [〈𝑣, 𝑢〉] ~R ↔
𝑓
<R ℎ)) | 
| 13 | 11, 12 | imbi12d 234 | 
. 2
⊢
([〈𝑣, 𝑢〉]
~R = ℎ → (((𝑓 <R 𝑔 ∧ 𝑔 <R [〈𝑣, 𝑢〉] ~R ) →
𝑓
<R [〈𝑣, 𝑢〉] ~R ) ↔
((𝑓
<R 𝑔 ∧ 𝑔 <R ℎ) → 𝑓 <R ℎ))) | 
| 14 |   | ltsrprg 7814 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P)) → ([〈𝑥, 𝑦〉] ~R
<R [〈𝑧, 𝑤〉] ~R ↔
(𝑥
+P 𝑤)<P (𝑦 +P
𝑧))) | 
| 15 | 14 | 3adant3 1019 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
([〈𝑥, 𝑦〉]
~R <R [〈𝑧, 𝑤〉] ~R ↔
(𝑥
+P 𝑤)<P (𝑦 +P
𝑧))) | 
| 16 |   | ltaprg 7686 | 
. . . . . . . 8
⊢ ((𝑟 ∈ P ∧
𝑠 ∈ P
∧ 𝑡 ∈
P) → (𝑟<P 𝑠 ↔ (𝑡 +P 𝑟)<P
(𝑡
+P 𝑠))) | 
| 17 | 16 | adantl 277 | 
. . . . . . 7
⊢ ((((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) ∧
(𝑟 ∈ P
∧ 𝑠 ∈
P ∧ 𝑡
∈ P)) → (𝑟<P 𝑠 ↔ (𝑡 +P 𝑟)<P
(𝑡
+P 𝑠))) | 
| 18 |   | simp1l 1023 | 
. . . . . . . 8
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑥 ∈
P) | 
| 19 |   | simp2r 1026 | 
. . . . . . . 8
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑤 ∈
P) | 
| 20 |   | addclpr 7604 | 
. . . . . . . 8
⊢ ((𝑥 ∈ P ∧
𝑤 ∈ P)
→ (𝑥
+P 𝑤) ∈ P) | 
| 21 | 18, 19, 20 | syl2anc 411 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑥
+P 𝑤) ∈ P) | 
| 22 |   | simp1r 1024 | 
. . . . . . . 8
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑦 ∈
P) | 
| 23 |   | simp2l 1025 | 
. . . . . . . 8
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑧 ∈
P) | 
| 24 |   | addclpr 7604 | 
. . . . . . . 8
⊢ ((𝑦 ∈ P ∧
𝑧 ∈ P)
→ (𝑦
+P 𝑧) ∈ P) | 
| 25 | 22, 23, 24 | syl2anc 411 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑦
+P 𝑧) ∈ P) | 
| 26 |   | simp3r 1028 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑢 ∈
P) | 
| 27 |   | addcomprg 7645 | 
. . . . . . . 8
⊢ ((𝑟 ∈ P ∧
𝑠 ∈ P)
→ (𝑟
+P 𝑠) = (𝑠 +P 𝑟)) | 
| 28 | 27 | adantl 277 | 
. . . . . . 7
⊢ ((((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) ∧
(𝑟 ∈ P
∧ 𝑠 ∈
P)) → (𝑟
+P 𝑠) = (𝑠 +P 𝑟)) | 
| 29 | 17, 21, 25, 26, 28 | caovord2d 6093 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P 𝑤)<P (𝑦 +P
𝑧) ↔ ((𝑥 +P
𝑤)
+P 𝑢)<P ((𝑦 +P
𝑧)
+P 𝑢))) | 
| 30 |   | addassprg 7646 | 
. . . . . . . 8
⊢ ((𝑥 ∈ P ∧
𝑤 ∈ P
∧ 𝑢 ∈
P) → ((𝑥
+P 𝑤) +P 𝑢) = (𝑥 +P (𝑤 +P
𝑢))) | 
| 31 | 18, 19, 26, 30 | syl3anc 1249 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P 𝑤) +P 𝑢) = (𝑥 +P (𝑤 +P
𝑢))) | 
| 32 |   | addassprg 7646 | 
. . . . . . . 8
⊢ ((𝑦 ∈ P ∧
𝑧 ∈ P
∧ 𝑢 ∈
P) → ((𝑦
+P 𝑧) +P 𝑢) = (𝑦 +P (𝑧 +P
𝑢))) | 
| 33 | 22, 23, 26, 32 | syl3anc 1249 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑦
+P 𝑧) +P 𝑢) = (𝑦 +P (𝑧 +P
𝑢))) | 
| 34 | 31, 33 | breq12d 4046 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(((𝑥
+P 𝑤) +P 𝑢)<P
((𝑦
+P 𝑧) +P 𝑢) ↔ (𝑥 +P (𝑤 +P
𝑢))<P (𝑦 +P
(𝑧
+P 𝑢)))) | 
| 35 | 29, 34 | bitrd 188 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P 𝑤)<P (𝑦 +P
𝑧) ↔ (𝑥 +P
(𝑤
+P 𝑢))<P (𝑦 +P
(𝑧
+P 𝑢)))) | 
| 36 | 15, 35 | bitrd 188 | 
. . . 4
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
([〈𝑥, 𝑦〉]
~R <R [〈𝑧, 𝑤〉] ~R ↔
(𝑥
+P (𝑤 +P 𝑢))<P
(𝑦
+P (𝑧 +P 𝑢)))) | 
| 37 |   | ltsrprg 7814 | 
. . . . . 6
⊢ (((𝑧 ∈ P ∧
𝑤 ∈ P)
∧ (𝑣 ∈
P ∧ 𝑢
∈ P)) → ([〈𝑧, 𝑤〉] ~R
<R [〈𝑣, 𝑢〉] ~R ↔
(𝑧
+P 𝑢)<P (𝑤 +P
𝑣))) | 
| 38 | 37 | 3adant1 1017 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
([〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ↔
(𝑧
+P 𝑢)<P (𝑤 +P
𝑣))) | 
| 39 |   | addclpr 7604 | 
. . . . . . 7
⊢ ((𝑧 ∈ P ∧
𝑢 ∈ P)
→ (𝑧
+P 𝑢) ∈ P) | 
| 40 | 23, 26, 39 | syl2anc 411 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑧
+P 𝑢) ∈ P) | 
| 41 |   | simp3l 1027 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
𝑣 ∈
P) | 
| 42 |   | addclpr 7604 | 
. . . . . . 7
⊢ ((𝑤 ∈ P ∧
𝑣 ∈ P)
→ (𝑤
+P 𝑣) ∈ P) | 
| 43 | 19, 41, 42 | syl2anc 411 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑤
+P 𝑣) ∈ P) | 
| 44 |   | ltaprg 7686 | 
. . . . . 6
⊢ (((𝑧 +P
𝑢) ∈ P
∧ (𝑤
+P 𝑣) ∈ P ∧ 𝑦 ∈ P) →
((𝑧
+P 𝑢)<P (𝑤 +P
𝑣) ↔ (𝑦 +P
(𝑧
+P 𝑢))<P (𝑦 +P
(𝑤
+P 𝑣)))) | 
| 45 | 40, 43, 22, 44 | syl3anc 1249 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑧
+P 𝑢)<P (𝑤 +P
𝑣) ↔ (𝑦 +P
(𝑧
+P 𝑢))<P (𝑦 +P
(𝑤
+P 𝑣)))) | 
| 46 | 38, 45 | bitrd 188 | 
. . . 4
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
([〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ↔
(𝑦
+P (𝑧 +P 𝑢))<P
(𝑦
+P (𝑤 +P 𝑣)))) | 
| 47 | 36, 46 | anbi12d 473 | 
. . 3
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(([〈𝑥, 𝑦〉]
~R <R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) ↔
((𝑥
+P (𝑤 +P 𝑢))<P
(𝑦
+P (𝑧 +P 𝑢)) ∧ (𝑦 +P (𝑧 +P
𝑢))<P (𝑦 +P
(𝑤
+P 𝑣))))) | 
| 48 |   | ltsopr 7663 | 
. . . . 5
⊢
<P Or P | 
| 49 |   | ltrelpr 7572 | 
. . . . 5
⊢
<P ⊆ (P ×
P) | 
| 50 | 48, 49 | sotri 5065 | 
. . . 4
⊢ (((𝑥 +P
(𝑤
+P 𝑢))<P (𝑦 +P
(𝑧
+P 𝑢)) ∧ (𝑦 +P (𝑧 +P
𝑢))<P (𝑦 +P
(𝑤
+P 𝑣))) → (𝑥 +P (𝑤 +P
𝑢))<P (𝑦 +P
(𝑤
+P 𝑣))) | 
| 51 |   | addclpr 7604 | 
. . . . . . . 8
⊢ ((𝑥 ∈ P ∧
𝑢 ∈ P)
→ (𝑥
+P 𝑢) ∈ P) | 
| 52 | 18, 26, 51 | syl2anc 411 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑥
+P 𝑢) ∈ P) | 
| 53 |   | addclpr 7604 | 
. . . . . . . 8
⊢ ((𝑦 ∈ P ∧
𝑣 ∈ P)
→ (𝑦
+P 𝑣) ∈ P) | 
| 54 | 22, 41, 53 | syl2anc 411 | 
. . . . . . 7
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑦
+P 𝑣) ∈ P) | 
| 55 |   | ltaprg 7686 | 
. . . . . . 7
⊢ (((𝑥 +P
𝑢) ∈ P
∧ (𝑦
+P 𝑣) ∈ P ∧ 𝑤 ∈ P) →
((𝑥
+P 𝑢)<P (𝑦 +P
𝑣) ↔ (𝑤 +P
(𝑥
+P 𝑢))<P (𝑤 +P
(𝑦
+P 𝑣)))) | 
| 56 | 52, 54, 19, 55 | syl3anc 1249 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P 𝑢)<P (𝑦 +P
𝑣) ↔ (𝑤 +P
(𝑥
+P 𝑢))<P (𝑤 +P
(𝑦
+P 𝑣)))) | 
| 57 | 56 | biimprd 158 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑤
+P (𝑥 +P 𝑢))<P
(𝑤
+P (𝑦 +P 𝑣)) → (𝑥 +P 𝑢)<P
(𝑦
+P 𝑣))) | 
| 58 |   | addassprg 7646 | 
. . . . . . . 8
⊢ ((𝑟 ∈ P ∧
𝑠 ∈ P
∧ 𝑡 ∈
P) → ((𝑟
+P 𝑠) +P 𝑡) = (𝑟 +P (𝑠 +P
𝑡))) | 
| 59 | 58 | adantl 277 | 
. . . . . . 7
⊢ ((((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) ∧
(𝑟 ∈ P
∧ 𝑠 ∈
P ∧ 𝑡
∈ P)) → ((𝑟 +P 𝑠) +P
𝑡) = (𝑟 +P (𝑠 +P
𝑡))) | 
| 60 | 18, 19, 26, 28, 59 | caov12d 6105 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑥
+P (𝑤 +P 𝑢)) = (𝑤 +P (𝑥 +P
𝑢))) | 
| 61 | 22, 19, 41, 28, 59 | caov12d 6105 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(𝑦
+P (𝑤 +P 𝑣)) = (𝑤 +P (𝑦 +P
𝑣))) | 
| 62 | 60, 61 | breq12d 4046 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P (𝑤 +P 𝑢))<P
(𝑦
+P (𝑤 +P 𝑣)) ↔ (𝑤 +P (𝑥 +P
𝑢))<P (𝑤 +P
(𝑦
+P 𝑣)))) | 
| 63 |   | ltsrprg 7814 | 
. . . . . 6
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑣 ∈
P ∧ 𝑢
∈ P)) → ([〈𝑥, 𝑦〉] ~R
<R [〈𝑣, 𝑢〉] ~R ↔
(𝑥
+P 𝑢)<P (𝑦 +P
𝑣))) | 
| 64 | 63 | 3adant2 1018 | 
. . . . 5
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
([〈𝑥, 𝑦〉]
~R <R [〈𝑣, 𝑢〉] ~R ↔
(𝑥
+P 𝑢)<P (𝑦 +P
𝑣))) | 
| 65 | 57, 62, 64 | 3imtr4d 203 | 
. . . 4
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
((𝑥
+P (𝑤 +P 𝑢))<P
(𝑦
+P (𝑤 +P 𝑣)) → [〈𝑥, 𝑦〉] ~R
<R [〈𝑣, 𝑢〉] ~R
)) | 
| 66 | 50, 65 | syl5 32 | 
. . 3
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(((𝑥
+P (𝑤 +P 𝑢))<P
(𝑦
+P (𝑧 +P 𝑢)) ∧ (𝑦 +P (𝑧 +P
𝑢))<P (𝑦 +P
(𝑤
+P 𝑣))) → [〈𝑥, 𝑦〉] ~R
<R [〈𝑣, 𝑢〉] ~R
)) | 
| 67 | 47, 66 | sylbid 150 | 
. 2
⊢ (((𝑥 ∈ P ∧
𝑦 ∈ P)
∧ (𝑧 ∈
P ∧ 𝑤
∈ P) ∧ (𝑣 ∈ P ∧ 𝑢 ∈ P)) →
(([〈𝑥, 𝑦〉]
~R <R [〈𝑧, 𝑤〉] ~R ∧
[〈𝑧, 𝑤〉]
~R <R [〈𝑣, 𝑢〉] ~R ) →
[〈𝑥, 𝑦〉]
~R <R [〈𝑣, 𝑢〉] ~R
)) | 
| 68 | 1, 5, 9, 13, 67 | 3ecoptocl 6683 | 
1
⊢ ((𝑓 ∈ R ∧
𝑔 ∈ R
∧ ℎ ∈
R) → ((𝑓
<R 𝑔 ∧ 𝑔 <R ℎ) → 𝑓 <R ℎ)) |