Newton Carneiro Affonso da Costa, Brazilian mathematical logic and science philosopher (Curitiba 16 September 1929 – From Portuguese, French, German and Danish descent Authored over 250 works between notes, papers and books Regarded as one of founders of paraconsistent logic His thesis Sistemas formais inconsistentes (1963) was abridged in English as On the theory of inconsistent formal systems in Notre Dame Journal of Formal Logic (1974) Introduced the notion of Curry algebra (1967) Defined the concepts of pragmatic truth and pragmatic probability (1986) Conceived the critical pragmatism Created Cn, hierarchies of logical calculus (1963) Introduced CHUn, a new hierarchy in set theory (1986) Introduced hyper real numbers ring and extended hyper-real numbers quasi-ring (2000) Introduced the concepts of paraconsistent superstructure and monomorphism between paraconsistent superstructures (2000) Enunciated the principle of tolerance or non-triviality in mathematics “from syntactical semantic standpoint, every mathematical theory is admissible unless it is trivial” With Rolando B. Chuaqui & Irene Mikenberg developed quasi-truth theory With R. Chuaqui established the concept of Suppes predicate (1988) With W.A. Carnielli showed that a less rigid logic can give a new response to called deontological paradoxes With J. Corcoran codiscovered the truth-set principle and the classical logic of variable-binding term operators With F.A. Doria showed that in the axiomatized version of dynamical systems theory chaotic properties of those system are undecidable and Gödel-incomplete With F.A. Doria solved the Hirsch and quadrature problems in chaos theory and classic mechanics With F.A. Doria showed that there is no algorithm for deciding from the equations of a dynamical system, whether the system is chaotic or not, or for deciding, from a given Hamiltonian, whether it can be integrated by quadratures (1991) With F.A. Doria introduced the exotic formalization With M.S. Berman proved that the universe is global and locally stable Introduced a general theory of valuations
Da Costa Cn calculus Da Costa algebra Da Costa C logic Von Weiszacker-da Costa principle of semantic consistency |

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