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Mirrors > Home > MPE Home > Th. List > hashrabrsn | Structured version Visualization version GIF version |
Description: The size of a restricted class abstraction restricted to a singleton is a nonnegative integer. (Contributed by Alexander van der Vekens, 22-Dec-2017.) |
Ref | Expression |
---|---|
hashrabrsn | ⊢ (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) ∈ ℕ0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2824 | . 2 ⊢ {𝑥 ∈ {𝐴} ∣ 𝜑} = {𝑥 ∈ {𝐴} ∣ 𝜑} | |
2 | rabrsn 4663 | . 2 ⊢ ({𝑥 ∈ {𝐴} ∣ 𝜑} = {𝑥 ∈ {𝐴} ∣ 𝜑} → ({𝑥 ∈ {𝐴} ∣ 𝜑} = ∅ ∨ {𝑥 ∈ {𝐴} ∣ 𝜑} = {𝐴})) | |
3 | fveq2 6673 | . . . 4 ⊢ ({𝑥 ∈ {𝐴} ∣ 𝜑} = ∅ → (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) = (♯‘∅)) | |
4 | hash0 13731 | . . . . 5 ⊢ (♯‘∅) = 0 | |
5 | 0nn0 11915 | . . . . 5 ⊢ 0 ∈ ℕ0 | |
6 | 4, 5 | eqeltri 2912 | . . . 4 ⊢ (♯‘∅) ∈ ℕ0 |
7 | 3, 6 | eqeltrdi 2924 | . . 3 ⊢ ({𝑥 ∈ {𝐴} ∣ 𝜑} = ∅ → (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) ∈ ℕ0) |
8 | fveq2 6673 | . . . 4 ⊢ ({𝑥 ∈ {𝐴} ∣ 𝜑} = {𝐴} → (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) = (♯‘{𝐴})) | |
9 | hashsng 13733 | . . . . . 6 ⊢ (𝐴 ∈ V → (♯‘{𝐴}) = 1) | |
10 | 1nn0 11916 | . . . . . 6 ⊢ 1 ∈ ℕ0 | |
11 | 9, 10 | eqeltrdi 2924 | . . . . 5 ⊢ (𝐴 ∈ V → (♯‘{𝐴}) ∈ ℕ0) |
12 | snprc 4656 | . . . . . 6 ⊢ (¬ 𝐴 ∈ V ↔ {𝐴} = ∅) | |
13 | fveq2 6673 | . . . . . . 7 ⊢ ({𝐴} = ∅ → (♯‘{𝐴}) = (♯‘∅)) | |
14 | 13, 6 | eqeltrdi 2924 | . . . . . 6 ⊢ ({𝐴} = ∅ → (♯‘{𝐴}) ∈ ℕ0) |
15 | 12, 14 | sylbi 219 | . . . . 5 ⊢ (¬ 𝐴 ∈ V → (♯‘{𝐴}) ∈ ℕ0) |
16 | 11, 15 | pm2.61i 184 | . . . 4 ⊢ (♯‘{𝐴}) ∈ ℕ0 |
17 | 8, 16 | eqeltrdi 2924 | . . 3 ⊢ ({𝑥 ∈ {𝐴} ∣ 𝜑} = {𝐴} → (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) ∈ ℕ0) |
18 | 7, 17 | jaoi 853 | . 2 ⊢ (({𝑥 ∈ {𝐴} ∣ 𝜑} = ∅ ∨ {𝑥 ∈ {𝐴} ∣ 𝜑} = {𝐴}) → (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) ∈ ℕ0) |
19 | 1, 2, 18 | mp2b 10 | 1 ⊢ (♯‘{𝑥 ∈ {𝐴} ∣ 𝜑}) ∈ ℕ0 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∨ wo 843 = wceq 1536 ∈ wcel 2113 {crab 3145 Vcvv 3497 ∅c0 4294 {csn 4570 ‘cfv 6358 0cc0 10540 1c1 10541 ℕ0cn0 11900 ♯chash 13693 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 ax-cnex 10596 ax-resscn 10597 ax-1cn 10598 ax-icn 10599 ax-addcl 10600 ax-addrcl 10601 ax-mulcl 10602 ax-mulrcl 10603 ax-mulcom 10604 ax-addass 10605 ax-mulass 10606 ax-distr 10607 ax-i2m1 10608 ax-1ne0 10609 ax-1rid 10610 ax-rnegex 10611 ax-rrecex 10612 ax-cnre 10613 ax-pre-lttri 10614 ax-pre-lttrn 10615 ax-pre-ltadd 10616 ax-pre-mulgt0 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-nel 3127 df-ral 3146 df-rex 3147 df-reu 3148 df-rab 3150 df-v 3499 df-sbc 3776 df-csb 3887 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-int 4880 df-iun 4924 df-br 5070 df-opab 5132 df-mpt 5150 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-res 5570 df-ima 5571 df-pred 6151 df-ord 6197 df-on 6198 df-lim 6199 df-suc 6200 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7117 df-ov 7162 df-oprab 7163 df-mpo 7164 df-om 7584 df-1st 7692 df-2nd 7693 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-1o 8105 df-er 8292 df-en 8513 df-dom 8514 df-sdom 8515 df-fin 8516 df-card 9371 df-pnf 10680 df-mnf 10681 df-xr 10682 df-ltxr 10683 df-le 10684 df-sub 10875 df-neg 10876 df-nn 11642 df-n0 11901 df-z 11985 df-uz 12247 df-fz 12896 df-hash 13694 |
This theorem is referenced by: (None) |
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