본 개관에서는 Ambrosetti-Prodi형의 해의 다중존재성에 관하여 살펴볼것이다.
We construct a sign reversing involution on the shifted rim hooktableaux with some conditions. Using the Stembridge's combinatorialinterpretation for Morris' rule, this involution give acombinatorial proof of the orthogonality of the first kindfor the spin characters of tilde S_n.
