On a synonymy relation for extensional 1st order theories. Part II. A sufficient criterion for non synonymy. Applications
Rendiconti del Seminario Matematico della Università di Padova, Volume 70 (1983), p. 13-19
@article{RSMUP_1983__70__13_0,
     author = {Bonotto, C. and Bressan, Aldo},
     title = {On a synonymy relation for extensional 1st order theories. Part II. A sufficient criterion for non synonymy. Applications},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {70},
     year = {1983},
     pages = {13-19},
     zbl = {0538.03025},
     mrnumber = {742106},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1983__70__13_0}
}
Bonotto, C.; Bressan, A. On a synonymy relation for extensional 1st order theories. Part II. A sufficient criterion for non synonymy. Applications. Rendiconti del Seminario Matematico della Università di Padova, Volume 70 (1983) pp. 13-19. http://www.numdam.org/item/RSMUP_1983__70__13_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). | Numdam | Zbl 0525.03019

[2] C. Bonotto - A. Bressan, On a synonymy relation for extensional 1st order theories. Part III: A necessary and sufficient condition for synonymy, to be printed on Rend. Sem. Mat. Univ. Padova.

[3] E. Mendelson, Introduction to mathematical logic, Van Nostrand-Rein-hold Co., New York, 1964. | MR 164867 | Zbl 0192.01901