Description: Letterwise operations on word concatenations. (Contributed by Thierry Arnoux, 28-Sep-2018)
Ref | Expression | ||
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Hypotheses | ofccat.1 | |
|
ofccat.2 | |
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ofccat.3 | |
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ofccat.4 | |
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ofccat.5 | |
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ofccat.6 | |
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Assertion | ofccat | |