| 1 | The application of inversion theory to nonlinear singular systems is an important problem. | |
| 2 | By using fundamental formula and adaptable estimation of inequality, inverse theorem of mean value ... | |
| 3 | A necessary and sufficient condition for the direct theorem of the derivatives of positive linear operators is given. | |
| 4 | This paper will introduce the application of Weda's Theorem and Converse Theorem in analytic geometry. | |
| 5 | Using the modulus of smoothness and K-functional, direct and inverse theorems of simultaneous approximation for a kind of multivariate trigonometric polynomial operators are established. |
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