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Theorem dpval3 30305
Description: Value of the decimal point construct. (Contributed by Thierry Arnoux, 16-Dec-2021.)
Hypotheses
Ref Expression
dpval2.a 𝐴 ∈ ℕ0
dpval2.b 𝐵 ∈ ℝ
Assertion
Ref Expression
dpval3 (𝐴.𝐵) = 𝐴𝐵

Proof of Theorem dpval3
StepHypRef Expression
1 dpval2.a . . 3 𝐴 ∈ ℕ0
2 dpval2.b . . 3 𝐵 ∈ ℝ
31, 2dpval2 30304 . 2 (𝐴.𝐵) = (𝐴 + (𝐵 / 10))
4 df-dp2 30283 . 2 𝐴𝐵 = (𝐴 + (𝐵 / 10))
53, 4eqtr4i 2799 1 (𝐴.𝐵) = 𝐴𝐵
Colors of variables: wff setvar class
Syntax hints:   = wceq 1507  wcel 2048  (class class class)co 6970  cr 10326  0cc0 10327  1c1 10328   + caddc 10330   / cdiv 11090  0cn0 11700  cdc 11904  cdp2 30282  .cdp 30299
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1758  ax-4 1772  ax-5 1869  ax-6 1928  ax-7 1964  ax-8 2050  ax-9 2057  ax-10 2077  ax-11 2091  ax-12 2104  ax-13 2299  ax-ext 2745  ax-sep 5054  ax-nul 5061  ax-pr 5180
This theorem depends on definitions:  df-bi 199  df-an 388  df-or 834  df-3an 1070  df-tru 1510  df-ex 1743  df-nf 1747  df-sb 2014  df-mo 2544  df-eu 2580  df-clab 2754  df-cleq 2765  df-clel 2840  df-nfc 2912  df-ral 3087  df-rex 3088  df-rab 3091  df-v 3411  df-sbc 3678  df-dif 3828  df-un 3830  df-in 3832  df-ss 3839  df-nul 4174  df-if 4345  df-sn 4436  df-pr 4438  df-op 4442  df-uni 4707  df-br 4924  df-opab 4986  df-id 5305  df-xp 5406  df-rel 5407  df-cnv 5408  df-co 5409  df-dm 5410  df-iota 6146  df-fun 6184  df-fv 6190  df-ov 6973  df-oprab 6974  df-mpo 6975  df-dp2 30283  df-dp 30300
This theorem is referenced by:  dpmul100  30308  dpval3rp  30311  dp0u  30312
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