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Theorem 1prl 7738
Description: The lower cut of the positive real number 'one'. (Contributed by Jim Kingdon, 28-Dec-2019.)
Assertion
Ref Expression
1prl  |-  ( 1st `  1P )  =  {
x  |  x  <Q  1Q }

Proof of Theorem 1prl
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 df-i1p 7650 . . 3  |-  1P  =  <. { x  |  x 
<Q  1Q } ,  {
y  |  1Q  <Q  y } >.
21fveq2i 5629 . 2  |-  ( 1st `  1P )  =  ( 1st `  <. { x  |  x  <Q  1Q } ,  { y  |  1Q  <Q  y } >. )
3 ltnqex 7732 . . 3  |-  { x  |  x  <Q  1Q }  e.  _V
4 gtnqex 7733 . . 3  |-  { y  |  1Q  <Q  y }  e.  _V
53, 4op1st 6290 . 2  |-  ( 1st `  <. { x  |  x  <Q  1Q } ,  { y  |  1Q  <Q  y } >. )  =  { x  |  x 
<Q  1Q }
62, 5eqtri 2250 1  |-  ( 1st `  1P )  =  {
x  |  x  <Q  1Q }
Colors of variables: wff set class
Syntax hints:    = wceq 1395   {cab 2215   <.cop 3669   class class class wbr 4082   ` cfv 5317   1stc1st 6282   1Qc1q 7464    <Q cltq 7468   1Pc1p 7475
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4523  ax-iinf 4679
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-int 3923  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-id 4383  df-iom 4682  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-1st 6284  df-qs 6684  df-ni 7487  df-nqqs 7531  df-ltnqqs 7536  df-i1p 7650
This theorem is referenced by:  1idprl  7773  recexprlem1ssl  7816  recexprlemss1l  7818
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