一种导出谐振子矩阵元<n|(f(X)+g(P))k|m>通式的简捷方法
일충도출해진자구진원<n|(f(X)+g(P))k|m>통식적간첩방법
A concise approach to derivation of the general formula of matrix element <n|(f(X)+g(P))k|m> for harmonic oscillator