bioavailability
发表于 2025-3-25 04:24:02
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Cytology
发表于 2025-3-25 10:11:44
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迷住
发表于 2025-3-25 13:01:30
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Psychogenic
发表于 2025-3-25 16:28:19
https://doi.org/10.1007/978-3-662-00417-3We first introduce a notation:.means that . is a covering and .
原告
发表于 2025-3-25 23:08:39
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吊胃口
发表于 2025-3-26 02:43:22
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instructive
发表于 2025-3-26 06:47:43
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马具
发表于 2025-3-26 10:56:26
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弯曲的人
发表于 2025-3-26 14:26:45
The Fourth Week: The fundamental group of a surfaceThe scene of today’s lecture is set in a region in a plane. We define a region to be a part of a plane surrounded by some closed curves. For example, the portion . in Figure 4.1 surrounded by the closed curves .., .., and .. is a region (i.e., the unshaded part of the figure).
fatuity
发表于 2025-3-26 18:41:27
The Fifth Week: Fundamental GroupsLast week we were considering curves in a region. A region was a part of the plane surrounded by closed curves (for example, the unshaded part of figure 5.1). We decided to call such a region land and the outside region a sea or a lake (such as the shaded part of Figure 5.1)