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Mirrors > Home > ILE Home > Th. List > df-rab | GIF version |
Description: Define a restricted class abstraction (class builder), which is the class of all 𝑥 in 𝐴 such that 𝜑 is true. Definition of [TakeutiZaring] p. 20. (Contributed by NM, 22-Nov-1994.) |
Ref | Expression |
---|---|
df-rab | ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wph | . . 3 wff 𝜑 | |
2 | vx | . . 3 setvar 𝑥 | |
3 | cA | . . 3 class 𝐴 | |
4 | 1, 2, 3 | crab 2352 | . 2 class {𝑥 ∈ 𝐴 ∣ 𝜑} |
5 | 2 | cv 1283 | . . . . 5 class 𝑥 |
6 | 5, 3 | wcel 1433 | . . . 4 wff 𝑥 ∈ 𝐴 |
7 | 6, 1 | wa 102 | . . 3 wff (𝑥 ∈ 𝐴 ∧ 𝜑) |
8 | 7, 2 | cab 2067 | . 2 class {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} |
9 | 4, 8 | wceq 1284 | 1 wff {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} |
Colors of variables: wff set class |
This definition is referenced by: rabid 2529 rabid2 2530 rabbi 2531 rabswap 2532 nfrab1 2533 nfrabxy 2534 rabbiia 2591 rabeqf 2594 cbvrab 2599 rabab 2620 elrabi 2746 elrabf 2747 elrab3t 2748 ralrab2 2757 rexrab2 2759 cbvrabcsf 2967 dfin5 2980 dfdif2 2981 ss2rab 3070 rabss 3071 ssrab 3072 rabss2 3077 ssrab2 3079 rabssab 3081 notab 3234 unrab 3235 inrab 3236 inrab2 3237 difrab 3238 dfrab2 3239 dfrab3 3240 notrab 3241 rabun2 3243 dfnul3 3254 rabn0r 3271 rabn0m 3272 rab0 3273 rabeq0 3274 dfif6 3353 rabsn 3459 reusn 3463 rabsneu 3465 elunirab 3614 elintrab 3648 ssintrab 3659 iunrab 3725 iinrabm 3740 intexrabim 3928 repizf2 3936 exss 3982 rabxp 4398 exse2 4719 mptpreima 4834 fndmin 5295 fncnvima2 5309 riotauni 5494 riotacl2 5501 snriota 5517 xp2 5819 unielxp 5820 dfopab2 5835 nnzrab 8375 nn0zrab 8376 shftlem 9704 shftuz 9705 shftdm 9710 negfi 10110 bdcrab 10643 |
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