Theorem icoreval 34637

Description: Value of the closed-below, open-above interval function on reals. (Contributed by ML, 26-Jul-2020.)

Assertion

Ref	Expression
icoreval	⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,)𝐵) = {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)})

Distinct variable groups:   𝑧,𝐴   𝑧,𝐵

Proof of Theorem icoreval

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ovres 7314	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴([,) ↾ (ℝ × ℝ))𝐵) = (𝐴[,)𝐵))
2		breq1 5069	. . . . 5 ⊢ (𝑥 = 𝐴 → (𝑥 ≤ 𝑧 ↔ 𝐴 ≤ 𝑧))
3	2	anbi1d 631	. . . 4 ⊢ (𝑥 = 𝐴 → ((𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦) ↔ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝑦)))
4	3	rabbidv 3480	. . 3 ⊢ (𝑥 = 𝐴 → {𝑧 ∈ ℝ ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)} = {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝑦)})
5		breq2 5070	. . . . 5 ⊢ (𝑦 = 𝐵 → (𝑧 < 𝑦 ↔ 𝑧 < 𝐵))
6	5	anbi2d 630	. . . 4 ⊢ (𝑦 = 𝐵 → ((𝐴 ≤ 𝑧 ∧ 𝑧 < 𝑦) ↔ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)))
7	6	rabbidv 3480	. . 3 ⊢ (𝑦 = 𝐵 → {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝑦)} = {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)})
8		eqid 2821	. . . 4 ⊢ ([,) ↾ (ℝ × ℝ)) = ([,) ↾ (ℝ × ℝ))
9	8	icorempo 34635	. . 3 ⊢ ([,) ↾ (ℝ × ℝ)) = (𝑥 ∈ ℝ, 𝑦 ∈ ℝ ↦ {𝑧 ∈ ℝ ∣ (𝑥 ≤ 𝑧 ∧ 𝑧 < 𝑦)})
10		reex 10628	. . . 4 ⊢ ℝ ∈ V
11	10	rabex 5235	. . 3 ⊢ {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)} ∈ V
12	4, 7, 9, 11	ovmpo 7310	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴([,) ↾ (ℝ × ℝ))𝐵) = {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)})
13	1, 12	eqtr3d 2858	1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,)𝐵) = {𝑧 ∈ ℝ ∣ (𝐴 ≤ 𝑧 ∧ 𝑧 < 𝐵)})

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  {crab 3142   class class class wbr 5066   × cxp 5553   ↾ cres 5557  (class class class)co 7156  ℝcr 10536   < clt 10675   ≤ cle 10676  [,)cico 12741

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-cnex 10593  ax-resscn 10594  ax-pre-lttri 10611  ax-pre-lttrn 10612

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-mpt 5147  df-id 5460  df-po 5474  df-so 5475  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-er 8289  df-en 8510  df-dom 8511  df-sdom 8512  df-pnf 10677  df-mnf 10678  df-xr 10679  df-ltxr 10680  df-le 10681  df-ico 12745

This theorem is referenced by:  icoreelrnab  34638  icoreelrn  34645  relowlssretop  34647