请问,空间一维单连通怎么理解?为什么环面所围成的区域是空间二维单连通,但不是空间一维单连通? 知乎 Template




You need a modern browser try chrome, to view this.

Background image: Hide Show

View Larger Image Image Credit: zhihu.com






Try and sketch some of theseXylophone, Cross, Cable car, President, Stork, Poet, Pot bellied pig, Bikini, Glitter, Liverwurst, view more ideas


please wait, the page is loading...

More Sketches

Take a peek at some of the sketches created by our users, are you a sketchite?

anonymous
anonymous
sketch #3296


anonymous
anonymous
sketch #654


anonymous
anonymous
sketch #3254 derp


anonymous
anonymous
sketch #5164


anonymous
anonymous
sketch #2423


anonymous
anonymous
sketch #5117


anonymous
anonymous
sketch #2862 Grumpy Cat


anonymous
anonymous
sketch #3192 Snake by Isaias Valenzuela Chaver


anonymous
anonymous
sketch #5264


sketchmaster
sketch #2598


anonymous
anonymous
sketch #5100 Shadow by An Nguyen


anonymous
anonymous
sketch #3052


Nina Mercedez
sketch #2849 dj


anonymous
anonymous
sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


anonymous
anonymous
sketch #5228 Rin & Len by Mark Phillips


anonymous
anonymous
sketch #4368


anonymous
anonymous
sketch #288 RK


anonymous
anonymous
sketch #2559 sun


anonymous
anonymous
sketch #3226 Goth Face


Loai Issa
sketch #2668 Butterfly by Loai Issa


sketchmaster
sketch #2628 Black haired women


anonymous
anonymous
sketch #4997 Rafael Leite Jose Rondon


anonymous
anonymous
sketch #3000


anonymous
anonymous
sketch #929 tree stump


anonymous
anonymous
sketch #4796


anonymous
anonymous
sketch #4881


anonymous
anonymous
sketch #5152


anonymous
anonymous
sketch #1221 səhər abbasova gözəi qız hamı məni çox seve anam da çox sevir


anonymous
anonymous
sketch #3071 Metallica - Kill &#;Em All by Dayana Aleman


anonymous
anonymous
sketch #2562

tomski请问,空间一维单连通怎么理解?为什么环面所围成的区域是空间二维单连通,但不是空间一维单连通? 知乎 coloring