@article {MATHEDUC.06321430,
author = {Vr\'abel, Peter},
title = {Mathematical tools -- semi-invariants. (Matematick\'e n\'astroje.)},
year = {2009},
journal = {Obzory matematiky, fyziky a informatiky},
volume = {38},
number = {2},
issn = {1335-4981},
pages = {11-15},
publisher = {PROTONIT s.r.o., Nitrianske Hrn\v{c}iarovce},
abstract = {Summary: A semi-invariant is the quantity which is changed monotonically and gains only finite values. Semi-invariants are often used in the analysis of evolving systems to show that certain final configurations must occur. Every investigated object of a problem is assigned to some quantity value and is defined as a suitable operation on the set of objects. We concentrate on the least or the largest value of the semi-invariant and we solve the problem by its means.},
msc2010 = {I40xx},
identifier = {2014e.00671},
}