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21. | abstract operator |
| 抽象算子 |
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22. | composition operator |
| 合成算子 |
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23. | conditional operator |
| 条件算子 |
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24. | isometric operator |
| 等距算子 |
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25. | symbolic operator |
| 符号算子 |
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26. | addition operator |
| 加法算子 |
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27. | multiplication operator |
| 乘法算子 |
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28. | majorant operator |
| 强算子 |
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29. | invertible operator |
| 可逆算子 |
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30. | relational operator |
| 关系算子 |
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