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Math of Rubik Cube:Megaminx=Ih Point Group: (36): SA[1/10]
李世春 2024-7-17 07:57
SA indicates a S10 operation, the product of A and the inversion operation (i). This is the definition in the textbook. In this video, SA can operate the triangle on the face W to the face D, while the other cubies are unchanged. However, the counterclockwise permutation of the triangle ...
个人分类: 2024-魔方和自然|684 次阅读|没有评论
野生蚕豆花
热度 1 李世春 2024-7-15 12:18
这种野花英文 叫 Vicia cracca (tufted vetch, cow vetch, bird vetch, blue vetch, boreal vetch), is a species of flowering plant in the pea and bean family Fabaceae.
个人分类: 2024-魔方和自然|709 次阅读|2 个评论 热度 1
“双节” 香蒲
热度 1 李世春 2024-7-13 08:02
这些香蒲是双节的,结果出的“香肠”是双节的,俺 就将计就计,称呼这些香蒲为 双节 香蒲 看看,有两节 “香肠” 大多数是 双节的 如果 有大面积的香蒲 ,必有 香蒲人家 科学网—香蒲 人家: 男才 女貌 - 李世春的博文 (sciencenet.cn)
个人分类: 2024-魔方和自然|967 次阅读|2 个评论 热度 1
野生 丁香
李世春 2024-7-12 07:15
个人分类: 2024-魔方和自然|988 次阅读|没有评论
Megaminx = Ih Point Group: (35): SW[9/10]
李世春 2024-7-10 13:06
SW indicates a S10 operation, the product of W and the inversion operation (i). This is the definition in the textbook. In this video, SW can operate the triangle on the face W to the face S, while the other cubies are unchanged. However, the counterclockwise permutation of the triangle ...
个人分类: 2024-魔方和自然|704 次阅读|没有评论
Megaminx = Ih Point Group: (34): SW[7/10]
李世春 2024-7-7 11:21
SW indicates a S10 operation, the product of W and the inversion operation (i). This is the definition in the textbook. In this video, SW can operate the triangle on the face W to the face S, while the other cubies are unchanged. However, the counterclockwise permutation of the triangle ...
个人分类: 2024-魔方和自然|709 次阅读|没有评论
小路边 的 野玫瑰
李世春 2024-7-4 08:51
生长在小路边,到时开花,到时花落,花枝没有刺,刺在粗枝,这花属于 Rose family,因此叫它 野玫瑰
个人分类: 2024-魔方和自然|1176 次阅读|没有评论
Megaminx = Ih Point Group: (33): SW[3/10]
李世春 2024-7-1 12:51
SW indicates a S10 operation, a product of W and the inversion operation (i). This is the definition in the textbook. In this video, SW can operate the triangle on the face W to the face S, while the other cubies are unchanged. However, the counterclockwise permutation of the triangle i ...
个人分类: 2024-魔方和自然|773 次阅读|没有评论
Megaminx = Ih Point Group: (32): SW[1/10]
李世春 2024-6-29 13:17
SW indicates a S10 operation, the product of W and the inversion operation (i). This is the definition in the textbook. In this video, SW can operate the triangle on the face W to the face S, while the other cubies are unchanged. However, the counterclockwise permutation of the triangle ...
个人分类: 2024-魔方和自然|834 次阅读|没有评论
花 和 鸭
李世春 2024-6-28 12:26
个人分类: 2024-魔方和自然|782 次阅读|没有评论

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