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Theorem 3bitr4ri 213
Description: A chained inference from transitive law for logical equivalence. (Contributed by NM, 2-Sep-1995.)
Hypotheses
Ref Expression
3bitr4i.1 (𝜑𝜓)
3bitr4i.2 (𝜒𝜑)
3bitr4i.3 (𝜃𝜓)
Assertion
Ref Expression
3bitr4ri (𝜃𝜒)

Proof of Theorem 3bitr4ri
StepHypRef Expression
1 3bitr4i.2 . 2 (𝜒𝜑)
2 3bitr4i.1 . . 3 (𝜑𝜓)
3 3bitr4i.3 . . 3 (𝜃𝜓)
42, 3bitr4i 187 . 2 (𝜑𝜃)
51, 4bitr2i 185 1 (𝜃𝜒)
Colors of variables: wff set class
Syntax hints:  wb 105
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108
This theorem depends on definitions:  df-bi 117
This theorem is referenced by:  dcnnOLD  849  excxor  1378  sbequ8  1847  2sb5  1983  2sb6  1984  2sb5rf  1989  2sb6rf  1990  moabs  2075  moanim  2100  2eu4  2119  2eu7  2120  sb8ab  2299  risset  2505  cbvreuvw  2711  reuind  2944  difundi  3389  indifdir  3393  unab  3404  inab  3405  rabeq0  3454  abeq0  3455  inssdif0im  3492  snprc  3659  snssOLD  3720  unipr  3825  uni0b  3836  pwtr  4221  opm  4236  onintexmid  4574  elxp2  4646  opthprc  4679  xpiundir  4687  elvvv  4691  relun  4745  inopab  4761  difopab  4762  ralxpf  4775  rexxpf  4776  dmiun  4838  rniun  5041  cnvresima  5120  imaco  5136  fnopabg  5341  dff1o2  5468  idref  5759  imaiun  5763  opabex3d  6124  opabex3  6125  onntri35  7238  elixx3g  9903  elfz2  10017  elfzuzb  10021  divalgb  11932  1nprm  12116  issubg3  13057  alsconv  14867
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