It is known that every equivelar abstract polytope of type {p1, …, pn − 1} has at least 2p1⋯pn − 1 flags. Polytopes that attain this lower bound are called tight. Here we investigate the conditions under which there is a tight orientably-regular polytope of type {p1, …, pn − 1}. We show that it is necessary and sufficient that whenever pi is odd, both pi − 1 and pi + 1 (when defined) are even divisors of 2pi.
@article{554, title = {Tight orientably-regular polytopes}, journal = {ARS MATHEMATICA CONTEMPORANEA}, volume = {9}, year = {2014}, doi = {10.26493/1855-3974.554.e50}, language = {EN}, url = {http://dml.mathdoc.fr/item/554} }
Conder, Marston; Cunningham, Gabe. Tight orientably-regular polytopes. ARS MATHEMATICA CONTEMPORANEA, Tome 9 (2014) . doi : 10.26493/1855-3974.554.e50. http://gdmltest.u-ga.fr/item/554/