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Theorem hashgt0 14350

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 14349	. . . 4 ⊢ (𝐴 ∈ 𝑉 → 0 ≤ (♯‘𝐴))
2	1	adantr 480	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → 0 ≤ (♯‘𝐴))
3		hasheq0 14325	. . . . 5 ⊢ (𝐴 ∈ 𝑉 → ((♯‘𝐴) = 0 ↔ 𝐴 = ∅))
4	3	necon3bid 2979	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ((♯‘𝐴) ≠ 0 ↔ 𝐴 ≠ ∅))
5	4	biimpar 477	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → (♯‘𝐴) ≠ 0)
6	2, 5	jca 511	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0))
7		0xr 11262	. . . 4 ⊢ 0 ∈ ℝ^*
8		hashxrcl 14319	. . . 4 ⊢ (𝐴 ∈ 𝑉 → (♯‘𝐴) ∈ ℝ^*)
9		xrltlen 13128	. . . 4 ⊢ ((0 ∈ ℝ^* ∧ (♯‘𝐴) ∈ ℝ^*) → (0 < (♯‘𝐴) ↔ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)))
10	7, 8, 9	sylancr 586	. . 3 ⊢ (𝐴 ∈ 𝑉 → (0 < (♯‘𝐴) ↔ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)))
11	10	biimpar 477	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ (0 ≤ (♯‘𝐴) ∧ (♯‘𝐴) ≠ 0)) → 0 < (♯‘𝐴))
12	6, 11	syldan 590	1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ≠ ∅) → 0 < (♯‘𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∈ wcel 2098 ≠ wne 2934 ∅c0 4317 class class class wbr 5141 ‘cfv 6536 0cc0 11109 ℝ^*cxr 11248 < clt 11249 ≤ cle 11250 ♯chash 14292

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-int 4944 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6293 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8264 df-wrecs 8295 df-recs 8369 df-rdg 8408 df-1o 8464 df-oadd 8468 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-card 9933 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11447 df-neg 11448 df-nn 12214 df-n0 12474 df-xnn0 12546 df-z 12560 df-uz 12824 df-fz 13488 df-hash 14293

This theorem is referenced by: hashgt0elexb 14364 clwwlkgt0 29743 clwwlkccat 29747 hashxpe 32523 cycpmco2lem5 32792 esumpinfval 33600

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