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Theorem nanbiOLD 1353
Description: Obsolete proof of nanbi 1352 as of 8-Mar-2020. (Contributed by Jeff Hoffman, 19-Nov-2007.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
nanbiOLD

Proof of Theorem nanbiOLD
StepHypRef Expression
1 pm4.57 497 . 2
2 df-nan 1344 . . 3
3 df-nan 1344 . . . 4
4 df-nan 1344 . . . . 5
5 nannot 1351 . . . . . 6
6 nannot 1351 . . . . . 6
75, 6anbi12i 697 . . . . 5
84, 7xchbinxr 311 . . . 4
93, 8anbi12i 697 . . 3
102, 9xchbinx 310 . 2
11 dfbi3 893 . 2
121, 10, 113bitr4ri 278 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  \/wo 368  /\wa 369  -/\wnan 1343
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-nan 1344
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