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Theorem prarloc2 7652
Description: A Dedekind cut is arithmetically located. This is a variation of prarloc 7651 which only constructs one (named) point and is therefore often easier to work with. It states that given a tolerance 𝑃, there are elements of the lower and upper cut which are exactly that tolerance from each other. (Contributed by Jim Kingdon, 26-Dec-2019.)
Assertion
Ref Expression
prarloc2 ((⟨𝐿, 𝑈⟩ ∈ P𝑃Q) → ∃𝑎𝐿 (𝑎 +Q 𝑃) ∈ 𝑈)
Distinct variable groups:   𝐿,𝑎   𝑃,𝑎   𝑈,𝑎

Proof of Theorem prarloc2
Dummy variable 𝑏 is distinct from all other variables.
StepHypRef Expression
1 prarloc 7651 . 2 ((⟨𝐿, 𝑈⟩ ∈ P𝑃Q) → ∃𝑎𝐿𝑏𝑈 𝑏 <Q (𝑎 +Q 𝑃))
2 prcunqu 7633 . . . . 5 ((⟨𝐿, 𝑈⟩ ∈ P𝑏𝑈) → (𝑏 <Q (𝑎 +Q 𝑃) → (𝑎 +Q 𝑃) ∈ 𝑈))
32rexlimdva 2625 . . . 4 (⟨𝐿, 𝑈⟩ ∈ P → (∃𝑏𝑈 𝑏 <Q (𝑎 +Q 𝑃) → (𝑎 +Q 𝑃) ∈ 𝑈))
43reximdv 2609 . . 3 (⟨𝐿, 𝑈⟩ ∈ P → (∃𝑎𝐿𝑏𝑈 𝑏 <Q (𝑎 +Q 𝑃) → ∃𝑎𝐿 (𝑎 +Q 𝑃) ∈ 𝑈))
54adantr 276 . 2 ((⟨𝐿, 𝑈⟩ ∈ P𝑃Q) → (∃𝑎𝐿𝑏𝑈 𝑏 <Q (𝑎 +Q 𝑃) → ∃𝑎𝐿 (𝑎 +Q 𝑃) ∈ 𝑈))
61, 5mpd 13 1 ((⟨𝐿, 𝑈⟩ ∈ P𝑃Q) → ∃𝑎𝐿 (𝑎 +Q 𝑃) ∈ 𝑈)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2178  wrex 2487  cop 3646   class class class wbr 4059  (class class class)co 5967  Qcnq 7428   +Q cplq 7430   <Q cltq 7433  Pcnp 7439
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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-coll 4175  ax-sep 4178  ax-nul 4186  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603  ax-iinf 4654
This theorem depends on definitions:  df-bi 117  df-dc 837  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-ral 2491  df-rex 2492  df-reu 2493  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-int 3900  df-iun 3943  df-br 4060  df-opab 4122  df-mpt 4123  df-tr 4159  df-eprel 4354  df-id 4358  df-po 4361  df-iso 4362  df-iord 4431  df-on 4433  df-suc 4436  df-iom 4657  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298  df-ov 5970  df-oprab 5971  df-mpo 5972  df-1st 6249  df-2nd 6250  df-recs 6414  df-irdg 6479  df-1o 6525  df-2o 6526  df-oadd 6529  df-omul 6530  df-er 6643  df-ec 6645  df-qs 6649  df-ni 7452  df-pli 7453  df-mi 7454  df-lti 7455  df-plpq 7492  df-mpq 7493  df-enq 7495  df-nqqs 7496  df-plqqs 7497  df-mqqs 7498  df-1nqqs 7499  df-rq 7500  df-ltnqqs 7501  df-enq0 7572  df-nq0 7573  df-0nq0 7574  df-plq0 7575  df-mq0 7576  df-inp 7614
This theorem is referenced by:  addcanprleml  7762  addcanprlemu  7763  aptiprleml  7787  aptiprlemu  7788
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