Consult Resources for information and code for all you ever wanted to know about the theory and practice of vector Spaces.
要了解向量空间的理论和实践所需的所有信息和代码，请参阅参考资料。
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This website includes many free design resources for the vector artist.
此网站为矢量创作者提供了不少免费资源。
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Having a stock of readymade vector images is a shortcut. If you are a designing greenhorn or an old hand, check out these ten resources for some inspiration and free vector art downloads.