Description: Concatenation of fixed length strings. (Contributed by Mario Carneiro, 26-Feb-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | s1s2 | |- <" A B C "> = ( <" A "> ++ <" B C "> ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-s2 | |- <" B C "> = ( <" B "> ++ <" C "> ) |
|
2 | s1cli | |- <" A "> e. Word _V |
|
3 | s1cli | |- <" B "> e. Word _V |
|
4 | df-s3 | |- <" A B C "> = ( <" A B "> ++ <" C "> ) |
|
5 | df-s2 | |- <" A B "> = ( <" A "> ++ <" B "> ) |
|
6 | 1 2 3 4 5 | cats1cat | |- <" A B C "> = ( <" A "> ++ <" B C "> ) |