infxrlbrnmpt2 - Mathbox for Glauco Siliprandi

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Theorem infxrlbrnmpt2 45853

Description: A member of a nonempty indexed set of reals is greater than or equal to the set's lower bound. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

**Hypotheses**
Ref	Expression
infxrlbrnmpt2.x	⊢ Ⅎ𝑥𝜑
infxrlbrnmpt2.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ^*)
infxrlbrnmpt2.c	⊢ (𝜑 → 𝐶 ∈ 𝐴)
infxrlbrnmpt2.d	⊢ (𝜑 → 𝐷 ∈ ℝ^*)
infxrlbrnmpt2.e	⊢ (𝑥 = 𝐶 → 𝐵 = 𝐷)

**Assertion**
Ref	Expression
infxrlbrnmpt2	⊢ (𝜑 → inf(ran (𝑥 ∈ 𝐴 ↦ 𝐵), ℝ^*, < ) ≤ 𝐷)

Distinct variable groups: 𝑥,𝐴 𝑥,𝐶 𝑥,𝐷 Allowed substitution hints: 𝜑(𝑥) 𝐵(𝑥)

**Proof of Theorem infxrlbrnmpt2**
Step	Hyp	Ref	Expression
1		infxrlbrnmpt2.x	. . 3 ⊢ Ⅎ𝑥𝜑
2		eqid 2739	. . 3 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐵)
3		infxrlbrnmpt2.b	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ^*)
4	1, 2, 3	rnmptssd 7065	. 2 ⊢ (𝜑 → ran (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ ℝ^*)
5		infxrlbrnmpt2.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ 𝐴)
6		infxrlbrnmpt2.d	. . 3 ⊢ (𝜑 → 𝐷 ∈ ℝ^*)
7		infxrlbrnmpt2.e	. . . 4 ⊢ (𝑥 = 𝐶 → 𝐵 = 𝐷)
8	2, 7	elrnmpt1s 5901	. . 3 ⊢ ((𝐶 ∈ 𝐴 ∧ 𝐷 ∈ ℝ^*) → 𝐷 ∈ ran (𝑥 ∈ 𝐴 ↦ 𝐵))
9	5, 6, 8	syl2anc 590	. 2 ⊢ (𝜑 → 𝐷 ∈ ran (𝑥 ∈ 𝐴 ↦ 𝐵))
10		infxrlb 13278	. 2 ⊢ ((ran (𝑥 ∈ 𝐴 ↦ 𝐵) ⊆ ℝ^* ∧ 𝐷 ∈ ran (𝑥 ∈ 𝐴 ↦ 𝐵)) → inf(ran (𝑥 ∈ 𝐴 ↦ 𝐵), ℝ^*, < ) ≤ 𝐷)
11	4, 9, 10	syl2anc 590	1 ⊢ (𝜑 → inf(ran (𝑥 ∈ 𝐴 ↦ 𝐵), ℝ^*, < ) ≤ 𝐷)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 Ⅎwnf 1790 ∈ wcel 2119 ⊆ wss 3883 class class class wbr 5072 ↦ cmpt 5153 ran crn 5619 infcinf 9344 ℝ^*cxr 11169 < clt 11170 ≤ cle 11171

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 ax-pre-sup 11107

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-po 5526 df-so 5527 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-er 8633 df-en 8884 df-dom 8885 df-sdom 8886 df-sup 9345 df-inf 9346 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371

This theorem is referenced by: limsuplesup 46142

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