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Definition df-s4 11804
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 "> concat  <" 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 11797 . 2  class  <" A B C D ">
61, 2, 3cs3 11796 . . 3  class  <" A B C ">
74cs1 11709 . . 3  class  <" D ">
8 cconcat 11708 . . 3  class concat
96, 7, 8co 6073 . 2  class  ( <" A B C "> concat  <" D "> )
105, 9wceq 1652 1  wff  <" A B C D ">  =  ( <" A B C "> concat  <" D "> )
Colors of variables: wff set class
This definition is referenced by:  s4eqd  11818  s4cld  11825  s4cli  11834  s4len  11846  s4prop  11852  s1s3  11861  s1s4  11862  s2s2  11866  s4s4  11869  konigsberg  21699
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