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Related theorems GIF version |
| Description: Lemma for supremum theorem. |
| Ref | Expression |
|---|---|
| supsrlem.1 | ⊢ C ∈ R |
| supsrlem.2 | ⊢ B = {w∣(C +R (w +R -1R)) ∈ A} |
| supsrlem4.1 | ⊢ D ∈ V |
| Ref | Expression |
|---|---|
| supsrlem4 | ⊢ (D ∈ B ↔ (C +R (D +R -1R)) ∈ A) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | supsrlem4.1 | . 2 ⊢ D ∈ V | |
| 2 | opreq1 3006 | . . . 4 ⊢ (x = D → (x +R -1R) = (D +R -1R)) | |
| 3 | 2 | opreq2d 3013 | . . 3 ⊢ (x = D → (C +R (x +R -1R)) = (C +R (D +R -1R))) |
| 4 | 3 | eleq1d 1155 | . 2 ⊢ (x = D → ((C +R (x +R -1R)) ∈ A ↔ (C +R (D +R -1R)) ∈ A)) |
| 5 | supsrlem.2 | . . 3 ⊢ B = {w∣(C +R (w +R -1R)) ∈ A} | |
| 6 | opreq1 3006 | . . . . . 6 ⊢ (w = x → (w +R -1R) = (x +R -1R)) | |
| 7 | 6 | opreq2d 3013 | . . . . 5 ⊢ (w = x → (C +R (w +R -1R)) = (C +R (x +R -1R))) |
| 8 | 7 | eleq1d 1155 | . . . 4 ⊢ (w = x → ((C +R (w +R -1R)) ∈ A ↔ (C +R (x +R -1R)) ∈ A)) |
| 9 | 8 | cbvabv 1424 | . . 3 ⊢ {w∣(C +R (w +R -1R)) ∈ A} = {x∣(C +R (x +R -1R)) ∈ A} |
| 10 | 5, 9 | eqtr 1119 | . 2 ⊢ B = {x∣(C +R (x +R -1R)) ∈ A} |
| 11 | 1, 4, 10 | elab2 1419 | 1 ⊢ (D ∈ B ↔ (C +R (D +R -1R)) ∈ A) |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 127 = weq 797 {cab 1090 = wceq 1091 ∈ wcel 1092 Vcvv 1348 (class class class)co 3001 Rcnr 3787 -1Rcm1r 3790 +R cplr 3791 |
| This theorem is referenced by: supsrlem5 4023 supsrlem6 4024 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-uni 1920 df-br 2063 df-opab 2098 df-xp 2424 df-cnv 2426 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fv 2438 df-opr 3003 |