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Related theorems GIF version |
| Description: Reverse closure law, when an operation's domain doesn't contain the empty set. |
| Ref | Expression |
|---|---|
| ndmopr.1 | ⊢ B ∈ V |
| ndmopr.2 | ⊢ dom F = (S × S) |
| ndmoprrcl.3 | ⊢ ¬ ∅ ∈ S |
| Ref | Expression |
|---|---|
| ndmoprrcl | ⊢ ((AFB) ∈ S → (A ∈ S ∧ B ∈ S)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ndmoprrcl.3 | . . 3 ⊢ ¬ ∅ ∈ S | |
| 2 | ndmopr.1 | . . . . 5 ⊢ B ∈ V | |
| 3 | ndmopr.2 | . . . . 5 ⊢ dom F = (S × S) | |
| 4 | 2, 3 | ndmopr 3059 | . . . 4 ⊢ (¬ (A ∈ S ∧ B ∈ S) → (AFB) = ∅) |
| 5 | 4 | eleq1d 1155 | . . 3 ⊢ (¬ (A ∈ S ∧ B ∈ S) → ((AFB) ∈ S ↔ ∅ ∈ S)) |
| 6 | 1, 5 | mtbiri 539 | . 2 ⊢ (¬ (A ∈ S ∧ B ∈ S) → ¬ (AFB) ∈ S) |
| 7 | 6 | a3i 69 | 1 ⊢ ((AFB) ∈ S → (A ∈ S ∧ B ∈ S)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ∧ wa 196 = wceq 1091 ∈ wcel 1092 Vcvv 1348 ∅c0 1707 × cxp 2408 dom cdm 2410 (class class class)co 3001 |
| This theorem is referenced by: ndmoprass 3062 ndmoprdistr 3063 ndmord 3064 ndmordi 3065 caoprmo 3084 brecop2 3243 eceqopreq 3249 mulcanpi 3821 recclpq 3866 ltexpq 3874 ltexpq2 3875 nsmallpq 3877 ltbtwnpq 3878 ltaddpr 3934 ltaddpr2 3935 ltexprlem2 3937 ltexprlem3 3938 ltexprlem4 3939 ltexprlem6 3941 ltexprlem7 3942 ltexpri 3943 addcanpr 3946 recexpr 3954 recexsrlem 4006 mappsrpr 4012 supsrlem1 4019 |
| 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-eu 1009 df-clab 1093 df-cleq 1097 df-clel 1099 df-rex 1206 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 |