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Theorem imim1 70
Description: A closed form of syllogism (see syl 15). Theorem *2.06 of [WhiteheadRussell] p. 100. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 25-May-2013.)
Assertion
Ref Expression
imim1

Proof of Theorem imim1
StepHypRef Expression
1 id 19 . 2
21imim1d 69 1
Colors of variables: wff setvar class
Syntax hints:   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
This theorem is referenced by:  pm2.83  71  looinv  174  pm3.33  568  tbw-ax1  1465  moim  2250  intss  3947
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