TY - JOUR ID - TI - Trigonometric Approximation by Modulus of Smoothness in Lp,α (X) AU - Alaa Adnan Auad AU - Mohammed Hamad Fayyadh PY - 2021 VL - 32 IS - 3 SP - 20 EP - 25 JO - Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية SN - 1814635X 25213520 AB - In this paper, we study the approximate properties of functions by means of trigonometric polynomials in weighted spaces. Relationships between modulus of smoothness of function derivatives and those of the jobs themselves are introduced. In the weighted spaces we also proved of theorems about the relationship between the derivatives of the polynomials for the best approximation and the best approximation of the functions

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