let A represents the rotation about origin through an angle pi/4 and B represents the reflection about y-axis.
Let C be the composite transformation obtained by transformed by A and then B.D be the composite transformation obtained by transformed by B and then A.
why C = C^-1 and D = D^-1 ???
can i know that without calculations?
plx answer detailed,thx a lot!!!!!!
problem of matrix
2007-08-06 3:17 am
回答 (1)
2007-08-06 5:55 am
✔ 最佳答案
你可以拿張紙(最好有透明膠版)，畫個十字同45度線，再在上面隨意畫一點，把它轉和反 看看便成。http://mathworld.wolfram.com/DihedralGroup.html
http://en.wikipedia.org/wiki/Dihedral_group
你的問題其實是有關上面的東西裡其中一個定理。
收錄日期: 2021-04-13 00:56:59
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