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Mirrors > Home > MPE Home > Th. List > elimel | Structured version Visualization version GIF version |
Description: Eliminate a membership hypothesis for weak deduction theorem, when special case 𝐵 ∈ 𝐶 is provable. (Contributed by NM, 15-May-1999.) |
Ref | Expression |
---|---|
elimel.1 | ⊢ 𝐵 ∈ 𝐶 |
Ref | Expression |
---|---|
elimel | ⊢ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2877 | . 2 ⊢ (𝐴 = if(𝐴 ∈ 𝐶, 𝐴, 𝐵) → (𝐴 ∈ 𝐶 ↔ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶)) | |
2 | eleq1 2877 | . 2 ⊢ (𝐵 = if(𝐴 ∈ 𝐶, 𝐴, 𝐵) → (𝐵 ∈ 𝐶 ↔ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶)) | |
3 | elimel.1 | . 2 ⊢ 𝐵 ∈ 𝐶 | |
4 | 1, 2, 3 | elimhyp 4488 | 1 ⊢ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶 |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 ifcif 4425 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-if 4426 |
This theorem is referenced by: fprg 6894 orduninsuc 7538 oawordeu 8164 oeoa 8206 omopth 8268 unfilem3 8768 inar1 10186 supsr 10523 renegcl 10938 peano5uzti 12060 eluzadd 12261 eluzsub 12262 ltweuz 13324 uzenom 13327 seqfn 13376 seq1 13377 seqp1 13379 sqeqor 13574 binom2 13575 nn0opth2 13628 faclbnd4lem2 13650 hashxp 13791 dvdsle 15652 divalglem7 15740 divalg 15744 gcdaddm 15863 smadiadetr 21280 iblcnlem 24392 ax5seglem8 26730 elimnv 28466 elimnvu 28467 nmlno0i 28577 nmblolbi 28583 blocn 28590 elimphu 28604 ubth 28656 htth 28701 ifhvhv0 28805 normlem6 28898 norm-iii 28923 norm3lemt 28935 ifchhv 29027 hhssablo 29046 hhssnvt 29048 shscl 29101 shslej 29163 shincl 29164 omlsii 29186 pjoml 29219 pjoc2 29222 chm0 29274 chne0 29277 chocin 29278 chj0 29280 chlejb1 29295 chnle 29297 ledi 29323 h1datom 29365 cmbr3 29391 pjoml2 29394 cmcm 29397 cmcm3 29398 lecm 29400 pjmuli 29472 pjige0 29474 pjhfo 29489 pj11 29497 eigre 29618 eigorth 29621 hoddi 29773 nmlnop0 29781 lnopeq 29792 lnopunilem2 29794 nmbdoplb 29808 nmcopex 29812 nmcoplb 29813 lnopcon 29818 lnfn0 29830 lnfnmul 29831 nmcfnex 29836 nmcfnlb 29837 lnfncon 29839 riesz4 29847 riesz1 29848 cnlnadjeu 29861 pjhmop 29933 pjidmco 29964 mdslmd1lem3 30110 mdslmd1lem4 30111 csmdsymi 30117 hatomic 30143 atord 30171 atcvat2 30172 bnj941 32154 bnj944 32320 kur14 32576 abs2sqle 33036 abs2sqlt 33037 onsucconn 33899 onsucsuccmp 33905 sdclem1 35181 mnurnd 40991 bnd2d 45211 |
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