A property that does not change after certain transformations.

Example: the side lengths of a triangle don't change when the triangle is rotated.

So we can say "triangle side lengths are invariant under rotation"

Finding invariants helps us understand the things we are dealing with.

Example: the side lengths of a triangle don't change when the triangle is rotated.

So we can say "triangle side lengths are invariant under rotation"

Finding invariants helps us understand the things we are dealing with.

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