In this paper we settle two long-standing questions regarding the combinatorial complexity of Minkowski sums of polytopes: We give a tight upper bound for the number of faces of a Minkowski sum, including a characterization of the case of equality. We similarly give a (tight) upper bound theorem for mixed facets of Minkowski sums. This has a wide range of applications and generalizes the classical Upper Bound Theorems of McMullen and Stanley.
Our main observation is that within (relative) Stanley–Reisner theory, it is possible to encode topological as well as combinatorial/geometric restrictions in an algebraic setup. We illustrate the technology by providing several simplicial isoperimetric and reverse isoperimetric inequalities in addition to our treatment of Minkowski sums.
@article{PMIHES_2016__124__99_0, author = {Adiprasito, Karim A. and Sanyal, Raman}, title = {Relative {Stanley{\textendash}Reisner} theory and {Upper} {Bound} {Theorems} for {Minkowski} sums}, journal = {Publications Math\'ematiques de l'IH\'ES}, pages = {99--163}, publisher = {Springer Berlin Heidelberg}, address = {Berlin/Heidelberg}, volume = {124}, year = {2016}, doi = {10.1007/s10240-016-0083-7}, mrnumber = {3578915}, zbl = {1368.52016}, language = {en}, url = {http://www.numdam.org/articles/10.1007/s10240-016-0083-7/} }
TY - JOUR AU - Adiprasito, Karim A. AU - Sanyal, Raman TI - Relative Stanley–Reisner theory and Upper Bound Theorems for Minkowski sums JO - Publications Mathématiques de l'IHÉS PY - 2016 SP - 99 EP - 163 VL - 124 PB - Springer Berlin Heidelberg PP - Berlin/Heidelberg UR - http://www.numdam.org/articles/10.1007/s10240-016-0083-7/ DO - 10.1007/s10240-016-0083-7 LA - en ID - PMIHES_2016__124__99_0 ER -
%0 Journal Article %A Adiprasito, Karim A. %A Sanyal, Raman %T Relative Stanley–Reisner theory and Upper Bound Theorems for Minkowski sums %J Publications Mathématiques de l'IHÉS %D 2016 %P 99-163 %V 124 %I Springer Berlin Heidelberg %C Berlin/Heidelberg %U http://www.numdam.org/articles/10.1007/s10240-016-0083-7/ %R 10.1007/s10240-016-0083-7 %G en %F PMIHES_2016__124__99_0
Adiprasito, Karim A.; Sanyal, Raman. Relative Stanley–Reisner theory and Upper Bound Theorems for Minkowski sums. Publications Mathématiques de l'IHÉS, Tome 124 (2016), pp. 99-163. doi : 10.1007/s10240-016-0083-7. http://www.numdam.org/articles/10.1007/s10240-016-0083-7/
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