math - What does the fancy R symbol mean as written here? -

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this assigned question have, , i'm not sure how interpret r-like symbol in exponent position. mean turing machine should accept variable numbers of repetitions of w?

fancy r

the notation wr means “w reversed.” problem asks turing machine shall, if starts word w on tape, append # , w reversed. afterwards, shall accept (i.e. terminate). instance, if tape contains example in beginning, should contain example#elpmaxe after turing machine ran.


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