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Definition df-s4 12826
Description: Define the length 4 word constructor. (Contributed by Mario Carneiro, 26-Feb-2016.)
Assertion
Ref Expression
df-s4  |-  <" A B C D ">  =  ( <" A B C "> ++  <" D "> )

Detailed syntax breakdown of Definition df-s4
StepHypRef Expression
1 cA . . 3  class  A
2 cB . . 3  class  B
3 cC . . 3  class  C
4 cD . . 3  class  D
51, 2, 3, 4cs4 12819 . 2  class  <" A B C D ">
61, 2, 3cs3 12818 . . 3  class  <" A B C ">
74cs1 12540 . . 3  class  <" D ">
8 cconcat 12539 . . 3  class ++
96, 7, 8co 6296 . 2  class  ( <" A B C "> ++  <" D "> )
105, 9wceq 1395 1  wff  <" A B C D ">  =  ( <" A B C "> ++  <" D "> )
Colors of variables: wff setvar class
This definition is referenced by:  s4eqd  12840  s4cld  12847  s4cli  12856  s4len  12868  s4prop  12874  s1s3  12883  s1s4  12884  s2s2  12888  s4s4  12891  usgraexmplvtx  24528  konigsberg  25113
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