+0  
 
 #1
avatar+114325 
+1

Reflection  of a vector across the xy plane  just reverses the vector components

 

The reflection matrix, R,  is

 

[  0    1

   1    0 ]

 

Proof

⟨a,b⟩   [  0  1      =     ⟨ a* 0  + b * 1,  a*1  + b*0 ⟩  =  ⟨b,a⟩

            1   0 ]

 

 

cool cool cool

 Dec 16, 2020

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