... Wissenschaften, Springer, Berlin, Germany, 2nd edition, 1983.18 O. A. Ladyˇzenskaja,V .A. Solonnikov,andN.N.Uralceva,Linear and Quasi-linear Equations of ParabolicType, American Mathematical Society, ... Providence, RI, USA, 1968.19 F. Yi, Z. Yang, and X. Wang, A variational inequality arising from European installment call optionspricing,”SIAM Journal on Mathematical Analysis, vol. 40, ... 2011, Article ID 309678, 21 pagesdoi:10.1155/2011/309678 Research Article A Variational Inequality from PricingConvertible BondHuiwen Yan and Fahuai YiSchool of Mathematics, South China Normal...