Guessing Game

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The opposite of move U2 is D2 or D'?
For me is D2.
A cuber told me it's D'.
He doesn't explain to me.
Why It's D'?
 
What is the opposite of scramble? Solution.
Let scramble be U2
Solution = U2
Hence, the opposite of U2 is U2, and there are many more possibilities, for example R' U R' U' R' U' R' U R U R' U R' U R' U' R2 U' R' U R' U R is also an opposite of U2
U2 is also the only inverse of U2
Opposite (Mirror) and inverse are different.
Opposite (Mirror) L2 is R2.
Inverse L2 is L2.
 
Opposite (Mirror) and inverse are different.
Opposite (Mirror) L2 is R2.
Inverse L2 is L2.
Yeah opposite and mirror are also different. Mirror depends on the axis, mirroring in M the mirror of U2 is still U2
In my explanation opposite and inverse are also different: U2 has one inverse, U2, but infinitely many opposites, one of which is U2
 
Before yes but a Cuber confused me.
This Cuber had defined D' opposite to U2.
For this Cuber D ss not opposite to U2.
Before for me opposite:
U2 opposite to U2.
Would you consider the opposite of a D Move to be D', U or U'?
 
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This thread Is very difficult.
What's It meant for opposite?
 

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