On a synonymy relation for extensional 1st order theories. Part III. A necessary and sufficient condition for synonymy
Rendiconti del Seminario Matematico della Università di Padova, Tome 71 (1984), pp. 1-13.
partie précédente On a synonymy relation for extensional 1st order theories. Part II. A sufficient criterion for non synonymy. Applications 
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     title = {On a synonymy relation for extensional 1st order theories. {Part} {III.} {A} necessary and sufficient condition for synonymy},
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Bonotto, C.; Bressan, A. On a synonymy relation for extensional 1st order theories. Part III. A necessary and sufficient condition for synonymy. Rendiconti del Seminario Matematico della Università di Padova, Tome 71 (1984), pp. 1-13. http://archive.numdam.org/item/RSMUP_1984__71__1_0/

[1] C. Bonotto - A. Bressan, On a synonymy relation for extensional 1st order theories, Part I: A notion of synonymy, Rend. Sem. Mat. Univ. Padova, 69 (1982), pp. 63-76. | Numdam | MR | Zbl

[2] C. Bonotto - A. Bressan, On a synonymy relation for extensional 1st order theories, Part II: A sufficient criterion for non-synonymy. Applications, Rend. Sem. Mat. Univ. Padova, 70 (1983), pp. 13-19. | Numdam | MR | Zbl

[3] A. Bressan, On general operators binding variables in an extensional first order theory, Atti Istituto Veneto di Scienze Lettere ed Arti. Tomo CXL (1982), pp. 115-130. | MR | Zbl

[4] E. Mendelson, Introduction to mathematical logic, Van Nostrand - Rein-hold Co., New York, 1964. | MR | Zbl