Metamath Proof Explorer
Description: The concatenation of a word with a singleton word (which can be over a
different alphabet) is a word. (Contributed by AV, 5-Mar-2022)
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Ref |
Expression |
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Assertion |
ccatws1clv |
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Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
wrdv |
|
2 |
|
s1cli |
|
3 |
|
ccatcl |
|
4 |
1 2 3
|
sylancl |
|