We show that any quasi-arithmetic mean and any non-quasi-arithmetic mean M (reasonably regular) are inconsistent in the sense that the only solutions f of both equations and are the constant ones.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm115-1-8, author = {Roman Ger and Tomasz Kochanek}, title = {An inconsistency equation involving means}, journal = {Colloquium Mathematicae}, volume = {116}, year = {2009}, pages = {87-99}, zbl = {1168.39006}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm115-1-8} }
Roman Ger; Tomasz Kochanek. An inconsistency equation involving means. Colloquium Mathematicae, Tome 116 (2009) pp. 87-99. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm115-1-8/