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Theorem 1prl 7765
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 7677 . . 3  |-  1P  =  <. { x  |  x 
<Q  1Q } ,  {
y  |  1Q  <Q  y } >.
21fveq2i 5638 . 2  |-  ( 1st `  1P )  =  ( 1st `  <. { x  |  x  <Q  1Q } ,  { y  |  1Q  <Q  y } >. )
3 ltnqex 7759 . . 3  |-  { x  |  x  <Q  1Q }  e.  _V
4 gtnqex 7760 . . 3  |-  { y  |  1Q  <Q  y }  e.  _V
53, 4op1st 6304 . 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 3670   class class class wbr 4086   ` cfv 5324   1stc1st 6296   1Qc1q 7491    <Q cltq 7495   1Pc1p 7502
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 4202  ax-sep 4205  ax-pow 4262  ax-pr 4297  ax-un 4528  ax-iinf 4684
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 2802  df-sbc 3030  df-csb 3126  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-int 3927  df-iun 3970  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-iom 4687  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-res 4735  df-ima 4736  df-iota 5284  df-fun 5326  df-fn 5327  df-f 5328  df-f1 5329  df-fo 5330  df-f1o 5331  df-fv 5332  df-1st 6298  df-qs 6703  df-ni 7514  df-nqqs 7558  df-ltnqqs 7563  df-i1p 7677
This theorem is referenced by:  1idprl  7800  recexprlem1ssl  7843  recexprlemss1l  7845
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