By Fenstad J.E., Gandy R.O., Sacks G.E. (eds.)

**Read Online or Download Generalized Recursion Theory II: Proceedings of the 1977 Oslo Symposium PDF**

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========+

Preface

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Bibliography

Index

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**Extra resources for Generalized Recursion Theory II: Proceedings of the 1977 Oslo Symposium**

**Example text**

B . c. (b) The distributivity of . with respect to +. The method of the proof will be the same as above. a· (b (a· b) + c) = a 1\ «b 1\ c') V (b' 1\ c)), + (a· c) = «a 1\ b) 1\ (a 1\ c)') V «a 1\ b)' 1\ (a 1\ c)) = = (a 1\ b 1\ a') V (a 1\ b 1\ c') V (a' 1\ a 1\ c) V (b' 1\ a 1\ c) = = a 1\ «b 1\ c') V (b' 1\ c)). 4 In a Boolean ring with lattice operations V and true: (a) a + a' = 1, 1\, the following identities are ALGEBRAIC STRUCTURES FOR LOGICAL CALCULI 21 = (a + b') . b, a V b = a . b' + b, (b) a /\ b (c) (d) (a + b') .

Obviously, U ~ is a filter containing F. Then use Zorn's lemma. 0 The lemma below is a good example of the filter based technique. It has also it's own importance in the proof of the first representation theorem. , be an MV-algebra and a E L, a", 1. , not containing a. PROOF: Let a ELand a", 1. By ~(a) we denote the set of all filters, which do not contain a. Obviously, {1} E ~(a) and therefore, ~(a) is nonempty. t. the ordinary inclusion. We show that F is prime. Suppose the opposite. Let b1 V b2 E F and b1 , b2 ¢ F.

Hence, VxEK X ~ a -t b. e. a -t b E K, which gives a -t b ~ VxEK x. (b )-(e) are proved analogously. (f) and (g) are the consequences of the isotonicity of -t in the second argument and antitonicity in the first one. 0 If the index set I is finite then the properties (c)-(g) of this lemma hold in every residuated lattice. A special case of residuated lattices are BL-algebras 1 , which have been introduced by P. Hajek to develop a kernel logical calculus, which would be included in various kinds of many- valued logical calculi.

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