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  3. carry out the argument for lemma 13b for the case...

Question: carry out the argument for lemma 13b for the case...

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LEMMA 13A theses Every wff has the same number of left as right paren- PRoOF. This was done as an example at the end of Section 1.1. - LEMMA 13B Any proper initial segment of a wff contains an excess of left parentheses. Thus no proper initial segment of a wff can itself be a wff.

Carry out the argument for Lemma 13B for the case of the operation varepsilon _{ eg}

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