Question: If w is a string then VANISH(w) is all strings you can form by replacing some symbols in w with the empty string. VANISH(L) is

If w is a string then VANISH(w) is all strings you

If w is a string then VANISH(w) is all strings you can form by replacing some symbols in w with the empty string. VANISH(L) is defined in the obvious way. Prove or disprove that if L is regular then VANISH(L) is also regular

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