@article{oai:nagasaki-u.repo.nii.ac.jp:00014890,
 author = {村田, 省三 and 橋口, 真理子},
 issue = {1･2},
 journal = {経営と経済, Journal of Business and Economics},
 month = {Sep},
 note = {In this paper, we re-examine the lemma over action commitment games in Murata & Hashiguchi (2010）． They prove a sufficient condition for the existence of non degenerated equilibrium with mixed strategy. This paper gives, as an answer to this, another lemma and one theorem. Two liner isoprofit curves appear only in the case that the profit function is quadratic that is polynominal with degree two. This lemma and thorem over duopoly games of action commitment assert there cannot be any mixed strategy equilibria when the equilibrium with simultanious move is stable. The same is the case that there exist two Stackelberg equilibrium., 菅家正瑞教授定年退職記念号, In Honour of Prof. Masamitsu Kanke, 經營と經濟, vol.90(1･2), pp.73-82; 2010},
 pages = {73--82},
 title = {レンマの証明},
 volume = {90},
 year = {2010}
}