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Theorem max1ALT 12266
Description: A number is less than or equal to the maximum of it and another. This version of max1 12265 omits the 𝐵 ∈ ℝ antecedent. Although it doesn't exploit undefined behavior, it is still considered poor style, and the use of max1 12265 is preferred. (Proof modification is discouraged.) (New usage is discouraged.) (Contributed by NM, 3-Apr-2005.)
Assertion
Ref Expression
max1ALT (𝐴 ∈ ℝ → 𝐴 ≤ if(𝐴𝐵, 𝐵, 𝐴))

Proof of Theorem max1ALT
StepHypRef Expression
1 leid 10423 . . 3 (𝐴 ∈ ℝ → 𝐴𝐴)
2 iffalse 4286 . . . 4 𝐴𝐵 → if(𝐴𝐵, 𝐵, 𝐴) = 𝐴)
32breq2d 4855 . . 3 𝐴𝐵 → (𝐴 ≤ if(𝐴𝐵, 𝐵, 𝐴) ↔ 𝐴𝐴))
41, 3syl5ibrcom 239 . 2 (𝐴 ∈ ℝ → (¬ 𝐴𝐵𝐴 ≤ if(𝐴𝐵, 𝐵, 𝐴)))
5 id 22 . . 3 (𝐴𝐵𝐴𝐵)
6 iftrue 4283 . . 3 (𝐴𝐵 → if(𝐴𝐵, 𝐵, 𝐴) = 𝐵)
75, 6breqtrrd 4871 . 2 (𝐴𝐵𝐴 ≤ if(𝐴𝐵, 𝐵, 𝐴))
84, 7pm2.61d2 174 1 (𝐴 ∈ ℝ → 𝐴 ≤ if(𝐴𝐵, 𝐵, 𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 2157  ifcif 4277   class class class wbr 4843  cr 10223  cle 10364
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183  ax-resscn 10281  ax-pre-lttri 10298
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ne 2972  df-nel 3075  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3387  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-br 4844  df-opab 4906  df-mpt 4923  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-res 5324  df-ima 5325  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-er 7982  df-en 8196  df-dom 8197  df-sdom 8198  df-pnf 10365  df-mnf 10366  df-xr 10367  df-ltxr 10368  df-le 10369
This theorem is referenced by: (None)
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