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Mirrors > Home > MPE Home > Th. List > infexd | Structured version Visualization version GIF version |
Description: An infimum is a set. (Contributed by AV, 2-Sep-2020.) |
Ref | Expression |
---|---|
infexd.1 | ⊢ (𝜑 → 𝑅 Or 𝐴) |
Ref | Expression |
---|---|
infexd | ⊢ (𝜑 → inf(𝐵, 𝐴, 𝑅) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-inf 9163 | . 2 ⊢ inf(𝐵, 𝐴, 𝑅) = sup(𝐵, 𝐴, ◡𝑅) | |
2 | infexd.1 | . . . 4 ⊢ (𝜑 → 𝑅 Or 𝐴) | |
3 | cnvso 6188 | . . . 4 ⊢ (𝑅 Or 𝐴 ↔ ◡𝑅 Or 𝐴) | |
4 | 2, 3 | sylib 217 | . . 3 ⊢ (𝜑 → ◡𝑅 Or 𝐴) |
5 | 4 | supexd 9173 | . 2 ⊢ (𝜑 → sup(𝐵, 𝐴, ◡𝑅) ∈ V) |
6 | 1, 5 | eqeltrid 2844 | 1 ⊢ (𝜑 → inf(𝐵, 𝐴, 𝑅) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2109 Vcvv 3430 Or wor 5501 ◡ccnv 5587 supcsup 9160 infcinf 9161 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pr 5355 ax-un 7579 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-ral 3070 df-rex 3071 df-rmo 3073 df-rab 3074 df-v 3432 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-nul 4262 df-if 4465 df-sn 4567 df-pr 4569 df-op 4573 df-uni 4845 df-br 5079 df-opab 5141 df-po 5502 df-so 5503 df-cnv 5596 df-sup 9162 df-inf 9163 |
This theorem is referenced by: infex 9213 omsfval 32240 wsucex 33799 prproropf1olem4 44910 prmdvdsfmtnof1 44991 |
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