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Mirrors > Home > MPE Home > Th. List > sbcex | Structured version Visualization version GIF version |
Description: By our definition of proper substitution, it can only be true if the substituted expression is a set. (Contributed by Mario Carneiro, 13-Oct-2016.) |
Ref | Expression |
---|---|
sbcex | ⊢ ([𝐴 / 𝑥]𝜑 → 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-sbc 3403 | . 2 ⊢ ([𝐴 / 𝑥]𝜑 ↔ 𝐴 ∈ {𝑥 ∣ 𝜑}) | |
2 | elex 3185 | . 2 ⊢ (𝐴 ∈ {𝑥 ∣ 𝜑} → 𝐴 ∈ V) | |
3 | 1, 2 | sylbi 206 | 1 ⊢ ([𝐴 / 𝑥]𝜑 → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1977 {cab 2596 Vcvv 3173 [wsbc 3402 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-12 2034 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-an 385 df-tru 1478 df-ex 1696 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-v 3175 df-sbc 3403 |
This theorem is referenced by: sbcco 3425 sbc5 3427 sbcan 3445 sbcor 3446 sbcn1 3448 sbcim1 3449 sbcbi1 3450 sbcal 3452 sbcex2 3453 sbcel1v 3462 sbcel21v 3464 sbcimdv 3465 sbcimdvOLD 3466 sbcrext 3478 sbcrextOLD 3479 sbcreu 3482 spesbc 3487 csbprc 3932 csbprcOLD 3933 sbcel12 3935 sbcne12 3938 sbcel2 3941 sbccsb2 3957 sbcbr123 4636 opelopabsb 4910 csbopab 4932 csbxp 5123 csbiota 5797 csbriota 6523 fi1uzind 13134 fi1uzindOLD 13140 bj-csbprc 32096 sbccomieg 36375 |
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