Inverse semigroup

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Introduces isometries as transformations preserving distances in the plane, focusing on symmetry and geometric relationships.

Covers conformal blocks, Young diagrams, and their significance in weight states.

Covers basic properties of natural numbers, including order relations and inverses.

Explores the direct sum of abelian groups, emphasizing bijections and uniqueness.

Explains injective, surjective, and bijective functions with examples and graphical representations.

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