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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 7601 | . . . 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 401 = wceq 1570 ∈ wcel 2145 ∅c0 4282 × cxp 5657 dom cdm 5659 (class class class)co 7416 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pr 5402 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 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 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-xp 5665 df-dm 5669 df-iota 6493 df-fv 6545 df-ov 7419 |
| This theorem is used by: ndmovass 7605 ndmovdistr 7606 ndmovord 7607 ndmovordi 7608 caovmo 7654 brecop2 8814 eceqoveq 8825 addcanpi 10911 mulcanpi 10912 ordpipq 10954 recmulnq 10976 recclnq 10978 ltexnq 10987 nsmallnq 10989 ltbtwnnq 10990 prlem934 11045 ltaddpr 11046 ltaddpr2 11047 ltexprlem2 11049 ltexprlem3 11050 ltexprlem4 11051 ltexprlem6 11053 ltexprlem7 11054 addcanpr 11058 prlem936 11059 mappsrpr 11120 |
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