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On the share of closed IL formulas which are also in GL

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arxiv 1309.3408 v3 pith:FRQDMU2N submitted 2013-09-13 math.LO math.CO

On the share of closed IL formulas which are also in GL

classification math.LO math.CO
keywords formulasclassesclosedasymptoticformsgivennormalwide
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Normal forms for wide classes of closed IL formulas were given in [4]. Here we quantify asymptotically, in exact numbers, how wide those classes are. As a consequence, we show that the "majority" of closed IL formulas have GL-equivalents, and by that, they have the same normal forms as GL formulas. Our approach is entirely syntactical, except for applying the results of [4]. As a byproduct we devise a convenient way of computing asymptotic behaviors of somewhat general classes of formulas given by their grammar rules. Its applications do not require any knowledge of the recurrence relations, generating functions, or the asymptotic enumeration methods, as all these are incorporated into two fundamental parameters.

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