The paper presents and discusses an example, namely a version of heterogeneous frrst-order logic and uses the classical theorem of Herbrand-Schmidt-Wang about the reduction of heterogeneous first-order logic to homogeneous first-order logic, in order to obtain two transformations between heterogeneous and homogeneous frrst-order logic which are different from the institution morphisms defined by Goguen and Burstall. Moreover, by considering a type of 2-cell among institution morphisms it is obtained a 2-category and also a 2-functor from this to another 2-category.

RESUMENPresentamos la contribución de Th. Tymoczko a la filosofía de la matemática y analizamos y evaluamos las demostraciones asistidas por ordenador y los razonamientos no rigurosos en la matemática experimental, con particular referencia al Teorema de los Cuatro Colores.PALABRAS CLAVETYMOCZKO – CUASI-EMPIRISMO – MATEMÁTICA EXPERIMENTAL – RAZONAMIENTO NO RIGUROSO – DEMOSTRACIONES ASISTIDAS POR ORDENADORABSTRACTWe present Th. Tymoczko’s contribution to the philosophy of mathematics, and we analyze and evaluate the computer-assisted proofs and the non-rigorous reasonings in the experimental mathematics, particularly in (...) reference to the Four-Colour Theorem.KEYWORDTYMOCZKO – QUASI-EMPIRICISM – EXPERIMENTAL MATHEMATICS – NON-RIGOROUS REASONING – COMPUTER-ASSISTED PROOF. (shrink)

Se analizan y evalúan las dos tradiciones de la filosofía de la matemática, la corriente principal o académica y la corriente disidente, a partir de las contribuciones de algunos de sus partidarios, y se las intenta aproximar a través de la concepción naturalista de P. Maddy y el problema de la objetividad matemática.