有限级数 meaning in English

finite progression
finite series
finite serise

For practical application the integrals in (3. 79) and (3. 80) have to be replaced by finite series .
为了实际应用，（379）和（380）里的积分项必须用有限级数代替。
Aapproximation of fourier inverse integral using fourier transform approximation for amplitude of harmonics in a finite fourier series summation
富氏级数中之谐波成份以富氏转换近似并以有限级数和近似富氏逆转换。
In allusion to diversified methods ' s shortcomings of solving girder ' s distortion , brings forward applying cantalever and finite progession method to analyze all girder ' s distortion , namely through frame analysis translates memory into analysis ; and use especial but simply method to solve common but complex problem , and expounds it through examples
摘要针对求解梁变形的几种方法的不足，提出用悬臂梁及有限级数法分析所有梁的变形，即通过悬臂梁结构分析，将记忆转化为分析，用特殊而简单的方法求解一般而复杂的问题。