<xsl:output> 元素仅告诉处理器我们希望的的变换结果 是 XML。
The <xsl:output> element simply tells the processor that we want XML as a result of our transformation.
本法避免了冗长的数学推导，仅应用了电路的等效变换概念。
These approaches only use the concept of equivalent transformation of circuits, and avoid the tedious mathematical derivation.
假如仅需求出a的本征值而不要求出本征函数，那么按照本章第3.3节，就不必求出变换矩阵s。
If only the eigenvalue of a and not the eigenfunctions are desired, it is not necessary, according to Section 3. 3, to obtain the transformation matrix s.
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