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\iteman{ZMATH 2014e.00671}
\itemau{Vr\'abel, Peter}
\itemti{Mathematical tools -- semi-invariants. (Matematick\'e n\'astroje.)}
\itemso{Obz. mat. fyz. inform. 38, No. 2, 11-15 (2009).}
\itemab
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.
\itemrv{~}
\itemcc{I40}
\itemut{semi-invariants; problem solving}
\itemli{}
\end