• 2021-04-14
    如果向量范数,则一定有向量范数http://edu-image.nosdn.127.net/_PhotoUploadUtils_3011608e-d630-4041-8cc8-8095cf5bf02f.pnghttp://edu-image.nosdn.127.net/_PhotoUploadUtils_58ab15be-9409-48b6-bad2-582bcc94d31e.png