This blog is partly devoted to the sharing of my learning of the English language (my well mastered mother tongue is Chinese and I am not an English teacher) and its *cultures*, partly to the current significant trends in Canada and in the world, and partly to my own random thoughts and little life. I am not religious, but I am somewhat interested in Christianity and Buddhism, among other personal interests. Welcome. And, have a good day.
Saturday, June 18, 2011
In topology, "a sphere is an orientable surface with no boundary".
(See http://en.wikipedia.org/wiki/Klein_bottle and http://en.wikipedia.org/wiki/Sphere#Topology .)
Well, the meaning of 'boundary' in topology is so confusing in my untrained eye.
Well, the meaning of 'boundary' in topology is so confusing in my untrained eye.
The household drainage brings great convenience to people's life. But the drain clog that is naturally inevitable to be formed is a small annoyance occasionally.
See, with every solution, even where it's great, comes accompanied problems of its own.
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