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Theorem hashgt0 14103

Description: The cardinality of a nonempty set is greater than zero. (Contributed by Thierry Arnoux, 2-Mar-2017.)

**Assertion**
Ref	Expression
hashgt0	⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → 0 < (♯‘𝐴))

**Proof of Theorem hashgt0**
Step	Hyp	Ref	Expression
1		hashge0 14102	. . . 4 ⊢ (𝐴 ∈ 𝑉 → 0 ≤ (♯‘𝐴))
2	1	adantr 481	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → 0 ≤ (♯‘𝐴))
3		hasheq0 14078	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → ((♯‘𝐴) = 0 ↔ 𝐴 = ∅))
4	3	necon3bid 2988	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ((♯‘𝐴) ≠ 0 ↔ 𝐴 ≠ ∅))
5	4	biimpar 478	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → (♯‘𝐴) ≠ 0)
6	2, 5	jca 512	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0))
7		0xr 11022	. . . 4 ⊢ 0 ∈ ℝ^*
8		hashxrcl 14072	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (♯‘𝐴) ∈ ℝ^*)
9		xrltlen 12880	. . . 4 ⊢ ((0 ∈ ℝ^* ∧ (♯‘𝐴) ∈ ℝ^*) → (0 < (♯‘𝐴) ↔ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)))
10	7, 8, 9	sylancr 587	. . 3 ⊢ (𝐴 ∈ 𝑉 → (0 < (♯‘𝐴) ↔ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)))
11	10	biimpar 478	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)) → 0 < (♯‘𝐴))
12	6, 11	syldan 591	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → 0 < (♯‘𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∈ wcel 2106 ≠ wne 2943 ∅c0 4256 class class class wbr 5074 ‘cfv 6433 0cc0 10871 ℝ^*cxr 11008 < clt 11009 ≤ cle 11010 ♯chash 14044

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-int 4880 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-1o 8297 df-oadd 8301 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-fin 8737 df-card 9697 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-n0 12234 df-xnn0 12306 df-z 12320 df-uz 12583 df-fz 13240 df-hash 14045

This theorem is referenced by: hashgt0elexb 14117 clwwlkgt0 28350 clwwlkccat 28354 hashxpe 31127 cycpmco2lem5 31397 esumpinfval 32041

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