Description: Concatenation of fixed length strings. (Contributed by Mario Carneiro, 26-Feb-2016)
Ref | Expression | ||
---|---|---|---|
Assertion | s1s4 | |- <" A B C D E "> = ( <" A "> ++ <" B C D E "> ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-s4 | |- <" B C D E "> = ( <" B C D "> ++ <" E "> ) |
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2 | s1cli | |- <" A "> e. Word _V |
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3 | s3cli | |- <" B C D "> e. Word _V |
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4 | df-s5 | |- <" A B C D E "> = ( <" A B C D "> ++ <" E "> ) |
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5 | s1s3 | |- <" A B C D "> = ( <" A "> ++ <" B C D "> ) |
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6 | 1 2 3 4 5 | cats1cat | |- <" A B C D E "> = ( <" A "> ++ <" B C D E "> ) |