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	Positive definiteness of real quadratic forms resulting from the variable-step L1-type approximations of convolution operators Journal article Science China Mathematics,2024, volume: 67, issue: 2, pages: 237-252 Authors: Liao, Hong Lin; Tang, Tao; Zhou, Tao Favorite \| View/Download：12/0 \| Submit date：2024/03/12 65M06 65M12 74A50 complementary convolution kernels discrete convolution kernels orthogonal convolution kernels positive definiteness variable time-stepping
	A calibration method for non-positive definite covariance matrix in multivariate data analysis Journal article Journal of Multivariate Analysis,2017, volume: 157, pages: 45-52 Authors: Huang, Chao; Farewell, Daniel; Pan, Jianxin Favorite \| View/Download：2/0 \| Submit date：2021/08/16 Covariance matrix calibration Nearness problem Non-positive definiteness Spectral decomposition