Finally a counter example shows that this method doesn't have symmetry.

最后举出反例说明它不具备对称性.

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Consider the following counter - example: If it is raining the lawn will be wet.

看看下面的 反 例: 如果下雨草坪就会湿.

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The paer illustrate some common errors concerning the linear vector group by giving counter examples.

用举反例的方法说明了一些有关向量组的线性相关性的常见错误.

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This paper provides a primary method to construct various counterexamples for linear time - dependent ordinary differential equations.

本文提供一种初等且相当简单的方法来构造非自治线性常微分方程的各类反例.

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