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| Mirrors > Home > MPE Home > Th. List > ndmovrcl | Structured version Visualization version GIF version | ||
| Description: Reverse closure law, when an operation's domain doesn't contain the empty set. (Contributed by NM, 3-Feb-1996.) |
| Ref | Expression |
|---|---|
| ndmov.1 | ⊢ dom 𝐹 = (𝑆 × 𝑆) |
| ndmovrcl.3 | ⊢ ¬ ∅ ∈ 𝑆 |
| Ref | Expression |
|---|---|
| ndmovrcl | ⊢ ((𝐴𝐹𝐵) ∈ 𝑆 → (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ndmovrcl.3 | . . 3 ⊢ ¬ ∅ ∈ 𝑆 | |
| 2 | ndmov.1 | . . . . 5 ⊢ dom 𝐹 = (𝑆 × 𝑆) | |
| 3 | 2 | ndmov 7596 | . . . 4 ⊢ (¬ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴𝐹𝐵) = ∅) |
| 4 | 3 | eleq1d 2847 | . . 3 ⊢ (¬ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → ((𝐴𝐹𝐵) ∈ 𝑆 ↔ ∅ ∈ 𝑆)) |
| 5 | 1, 4 | mtbiri 330 | . 2 ⊢ (¬ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → ¬ (𝐴𝐹𝐵) ∈ 𝑆) |
| 6 | 5 | con4i 115 | 1 ⊢ ((𝐴𝐹𝐵) ∈ 𝑆 → (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 400 = wceq 1569 ∈ wcel 2142 ∅c0 4285 × cxp 5658 dom cdm 5660 (class class class)co 7412 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pr 5403 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-opab 5173 df-xp 5666 df-dm 5670 df-iota 6492 df-fv 6544 df-ov 7415 |
| This theorem is used by: ndmovass 7600 ndmovdistr 7601 ndmovord 7602 ndmovordi 7603 caovmo 7649 brecop2 8807 eceqoveq 8818 addcanpi 10890 mulcanpi 10891 ordpipq 10933 recmulnq 10955 recclnq 10957 ltexnq 10966 nsmallnq 10968 ltbtwnnq 10969 prlem934 11024 ltaddpr 11025 ltaddpr2 11026 ltexprlem2 11028 ltexprlem3 11029 ltexprlem4 11030 ltexprlem6 11032 ltexprlem7 11033 addcanpr 11037 prlem936 11038 mappsrpr 11099 |
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