$K^{left( {alpha ,beta } right)} left( {x,y} right): = sumlimits_{k = 0}^infty {C_k ^{left( {alpha ,beta } right)} Q_k ^{left( {alpha ,beta } right)} left( x right)Q_k ^{left( {alpha ,beta } right)} left( y right)} $K^{left( {alpha ,beta } right)} left( {x,y} right): = sumlimits_{k = 0}^infty {C_k ^{left( {alpha ,beta } right)} Q_k ^{left( {alpha ,beta } right)} left( x right)Q_k ^{left( {alpha ,beta } right)} left( y right)} |