xrltmaxsup - Intuitionistic Logic Explorer

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Theorem xrltmaxsup 11950

Description: The maximum as a least upper bound. (Contributed by Jim Kingdon, 10-May-2023.)

**Assertion**
Ref	Expression
xrltmaxsup	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝐶 < sup({𝐴, 𝐵}, ℝ^, < ) ↔ (𝐶 < 𝐴 ∨ 𝐶 < 𝐵)))

**Proof of Theorem xrltmaxsup**
Step	Hyp	Ref	Expression
1		simpl1 1027	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^, < )) → 𝐴 ∈ ℝ^*)
2		simpl2 1028	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^, < )) → 𝐵 ∈ ℝ^*)
3		simpl3 1029	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^, < )) → 𝐶 ∈ ℝ^*)
4		simpr 110	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^, < )) → 𝐶 < sup({𝐴, 𝐵}, ℝ^*, < ))
5		xrmaxleastlt 11949	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ (𝐶 ∈ ℝ^ ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^*, < ))) → (𝐶 < 𝐴 ∨ 𝐶 < 𝐵))
6	1, 2, 3, 4, 5	syl22anc 1275	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < sup({𝐴, 𝐵}, ℝ^, < )) → (𝐶 < 𝐴 ∨ 𝐶 < 𝐵))
7		simpl3 1029	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → 𝐶 ∈ ℝ^)
8		simpl1 1027	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → 𝐴 ∈ ℝ^)
9		simpl2 1028	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → 𝐵 ∈ ℝ^)
10		xrmaxcl 11945	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → sup({𝐴, 𝐵}, ℝ^, < ) ∈ ℝ^*)
11	8, 9, 10	syl2anc 411	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → sup({𝐴, 𝐵}, ℝ^, < ) ∈ ℝ^*)
12		simpr 110	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝐶 < 𝐴) → 𝐶 < 𝐴)
13		xrmax1sup 11946	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → 𝐴 ≤ sup({𝐴, 𝐵}, ℝ^, < ))
14	8, 9, 13	syl2anc 411	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → 𝐴 ≤ sup({𝐴, 𝐵}, ℝ^, < ))
15	7, 8, 11, 12, 14	xrltletrd 10150	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐴) → 𝐶 < sup({𝐴, 𝐵}, ℝ^, < ))
16		simpl3 1029	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → 𝐶 ∈ ℝ^)
17		simpl2 1028	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → 𝐵 ∈ ℝ^)
18		simpl1 1027	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → 𝐴 ∈ ℝ^)
19	18, 17, 10	syl2anc 411	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → sup({𝐴, 𝐵}, ℝ^, < ) ∈ ℝ^*)
20		simpr 110	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ 𝐶 < 𝐵) → 𝐶 < 𝐵)
21		xrmax2sup 11947	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → 𝐵 ≤ sup({𝐴, 𝐵}, ℝ^, < ))
22	18, 17, 21	syl2anc 411	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → 𝐵 ≤ sup({𝐴, 𝐵}, ℝ^, < ))
23	16, 17, 19, 20, 22	xrltletrd 10150	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ 𝐶 < 𝐵) → 𝐶 < sup({𝐴, 𝐵}, ℝ^, < ))
24	15, 23	jaodan 805	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (𝐶 < 𝐴 ∨ 𝐶 < 𝐵)) → 𝐶 < sup({𝐴, 𝐵}, ℝ^, < ))
25	6, 24	impbida 600	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) → (𝐶 < sup({𝐴, 𝐵}, ℝ^, < ) ↔ (𝐶 < 𝐴 ∨ 𝐶 < 𝐵)))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∨ wo 716 ∧ w3a 1005 ∈ wcel 2205 {cpr 3692 class class class wbr 4111 supcsup 7275 ℝ^*cxr 8312 < clt 8313 ≤ cle 8314

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-coll 4227 ax-sep 4230 ax-nul 4238 ax-pow 4289 ax-pr 4324 ax-un 4556 ax-setind 4661 ax-iinf 4712 ax-cnex 8223 ax-resscn 8224 ax-1cn 8225 ax-1re 8226 ax-icn 8227 ax-addcl 8228 ax-addrcl 8229 ax-mulcl 8230 ax-mulrcl 8231 ax-addcom 8232 ax-mulcom 8233 ax-addass 8234 ax-mulass 8235 ax-distr 8236 ax-i2m1 8237 ax-0lt1 8238 ax-1rid 8239 ax-0id 8240 ax-rnegex 8241 ax-precex 8242 ax-cnre 8243 ax-pre-ltirr 8244 ax-pre-ltwlin 8245 ax-pre-lttrn 8246 ax-pre-apti 8247 ax-pre-ltadd 8248 ax-pre-mulgt0 8249 ax-pre-mulext 8250 ax-arch 8251 ax-caucvg 8252

This theorem depends on definitions: df-bi 117 df-dc 843 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rmo 2530 df-rab 2531 df-v 2817 df-sbc 3045 df-csb 3141 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-nul 3511 df-if 3623 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-int 3952 df-iun 3995 df-br 4112 df-opab 4174 df-mpt 4175 df-tr 4211 df-id 4416 df-po 4419 df-iso 4420 df-iord 4489 df-on 4491 df-ilim 4492 df-suc 4494 df-iom 4715 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-res 4763 df-ima 4764 df-iota 5314 df-fun 5356 df-fn 5357 df-f 5358 df-f1 5359 df-fo 5360 df-f1o 5361 df-fv 5362 df-riota 6005 df-ov 6055 df-oprab 6056 df-mpo 6057 df-1st 6336 df-2nd 6337 df-recs 6538 df-frec 6624 df-sup 7277 df-pnf 8315 df-mnf 8316 df-xr 8317 df-ltxr 8318 df-le 8319 df-sub 8451 df-neg 8452 df-reap 8854 df-ap 8861 df-div 8952 df-inn 9243 df-2 9301 df-3 9302 df-4 9303 df-n0 9502 df-z 9583 df-uz 9860 df-rp 9993 df-seqfrec 10817 df-exp 10908 df-cj 11535 df-re 11536 df-im 11537 df-rsqrt 11691 df-abs 11692

This theorem is referenced by: xrmaxlesup 11952 xrmaxaddlem 11953 xrmaxadd 11954 xrminltinf 11965

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