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content/杂七杂八/数学/常微分方程 大逃杀笔记.md
@@ -58,4 +58,7 @@ $$
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反过来说,看方向场就能看到积分曲线,从而看到解的几何特征。
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-等倾线用于看积分曲线的分布状况。等倾线就是每个点斜率都一样的曲线。
+等倾线用于看积分曲线的分布状况。等倾线就是每个点斜率都一样的曲线。
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+斜率为0的等倾线是水平等倾线,垂直的则是垂直等倾线。
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