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| 21. | lacunary series |
| 缺项级数 |
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| 22. | series expansion |
| 级数展开;级数展开式 |
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| 23. | region of convergence |
| 收敛区;收敛区域 |
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| 24. | level of addressing |
| 定址级数 |
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| 25. | contraction section |
| 收敛部分|收敛段 |
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| 26. | reversion of a series |
| 级数的逆演|级数的反演 |
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| 27. | an arithmetic(al) [a geometric(al)] progression |
| 算术 [几何] 级数,等差 [等比] 级数 |
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| 28. | generating series |
| 生成级数 |
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| 29. | value of series |
| 级数的和，级数的值 |
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| 30. | finite progression |
| 有限级数 |
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