We study categoricity in power for reduced models of first order logic without equality.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-fm170-1-5, author = {H. Jerome Keisler and Arnold W. Miller}, title = {Categoricity without equality}, journal = {Fundamenta Mathematicae}, volume = {167}, year = {2001}, pages = {87-106}, zbl = {0993.03045}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm170-1-5} }
H. Jerome Keisler; Arnold W. Miller. Categoricity without equality. Fundamenta Mathematicae, Tome 167 (2001) pp. 87-106. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm170-1-5/