第二章 点集
1、证明：![](https://wkrtcs.bdimg.com/rtcs/image?w=48&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"48","h":"25","dataType":"gif","c":"word/media/image1.png"})
的充要条件是在任意含有的领域（不一定以为中心）中，恒有异于的点属于E（事实上，这样的还有无穷多个）；的充要条件则是有含有的领域（同样，不一定以为中心）存在，使.
![](https://wkrtcs.bdimg.com/rtcs/image?w=576&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"576","h":"176","dataType":"gif","c":"word/media/image7.png"})
4、设![](https://wkrtcs.bdimg.com/rtcs/image?w=20&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"20","h":"24","dataType":"gif","c":"word/media/image8.png"})
是函数
![](https://wkrtcs.bdimg.com/rtcs/image?w=129&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"129","h":"67","dataType":"gif","c":"word/media/image9.png"})
的图形上的点所作成的集合，在![](https://wkrtcs.bdimg.com/rtcs/image?w=21&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"21","h":"20","dataType":"gif","c":"word/media/image10.png"})
内讨论.
![](https://wkrtcs.bdimg.com/rtcs/image?w=12&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"12","h":"19","dataType":"gif","c":"word/media/image12.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=548&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"548","h":"44","dataType":"gif","c":"word/media/image14.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=630&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"630","h":"151","dataType":"gif","c":"word/media/image15.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=594&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"594","h":"255","dataType":"gif","c":"word/media/image17.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=572&md5sum=7153f6a211cff603cca7b82dacf0583f&sign=7702851003&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=30&ipr={"t":"img","w":"572","h":"73","dataType":"gif","c":"word/media/image20.png"})
2011级1班 何沁萌
222011314011145
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