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Theorem disjsnxp 6411
Description: The sets in the cartesian product of singletons with other sets, are disjoint. (Contributed by Glauco Siliprandi, 11-Oct-2020.)
Assertion
Ref Expression
disjsnxp  |- Disj  j  e.  A  ( { j }  X.  B )
Distinct variable group:    A, j
Allowed substitution hint:    B( j)

Proof of Theorem disjsnxp
StepHypRef Expression
1 sndisj 4089 . . . 4  |- Disj  j  e.  A  { j }
21a1i 9 . . 3  |-  ( T. 
-> Disj  j  e.  A  {
j } )
32disjxp1 6410 . 2  |-  ( T. 
-> Disj  j  e.  A  ( { j }  X.  B ) )
43mptru 1407 1  |- Disj  j  e.  A  ( { j }  X.  B )
Colors of variables: wff set class
Syntax hints:   T. wtru 1399   {csn 3673  Disj wdisj 4069    X. cxp 4729
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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-rmo 2519  df-v 2805  df-sbc 3033  df-csb 3129  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-disj 4070  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-fo 5339  df-fv 5341  df-1st 6312
This theorem is referenced by:  fsum2dlemstep  12058  fisumcom2  12062  fprod2dlemstep  12246  fprodcom2fi  12250
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