This is an announcement for the paper "Quotients of continuous convex functions on nonreflexive Banach spaces" by P. Holicky, O. Kalenda, L. Vesely, and L. Zajicek. Abstract: On each nonreflexive Banach space X there exists a positive continuous convex function f such that 1/f is not a d.c. function (i.e., a difference of two continuous convex functions). This result together with known ones implies that X is reflexive if and only if each everywhere defined quotient of two continuous convex functions is a d.c. function. Our construction gives also a stronger version of Klee's result concerning renormings of nonreflexive spaces and non-norm-attaining functionals. Archive classification: math.FA Mathematics Subject Classification: 46B10; 46B03 Remarks: 5 pages The source file(s), 06HKVZscisly.tex: 19081 bytes, is(are) stored in gzipped form as 0706.0633.gz with size 7kb. The corresponding postcript file has gzipped size 71kb. Submitted from: zajicek@karlin.mff.cuni.cz The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0706.0633 or http://arXiv.org/abs/0706.0633 or by email in unzipped form by transmitting an empty message with subject line uget 0706.0633 or in gzipped form by using subject line get 0706.0633 to: math@arXiv.org.