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LEVELS OF IMPLICATION AND TYPE FREE THEORIES OF CLASSIFICATIONS WITH APPROXIMATION OPERATOR
Author(s) -
Cantini Andrea
Publication year - 1992
Publication title -
mathematical logic quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.473
H-Index - 28
eISSN - 1521-3870
pISSN - 0942-5616
DOI - 10.1002/malq.19920380109
Subject(s) - mathematics , hierarchy , operator (biology) , property (philosophy) , type (biology) , relation (database) , pure mathematics , algebra over a field , calculus (dental) , computer science , epistemology , data mining , medicine , biochemistry , chemistry , philosophy , dentistry , repressor , transcription factor , economics , market economy , gene , ecology , biology
We investigate a theory of Frege structures extended by the Myhill‐Flagg hierarchy of implications. We study its relation to a property theory with an approximation operator and we give a proof theoretical analysis of the basic system involved. MSC: 03F35, 03D60.