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An "Embedding" is a 1-1 function that takes the domain into the codomain, preserving any appropriate structure. In a sense it is a copy of the "source" in the "destination." For numbers we have the following: * The integers can be embedded into the rational numbers in an obvious way, * the rational numbers can be embedded into the algebraic numbers, * the algebraic numbers can be embedded into the real numbers, and * the real numbers can be embedded into the complex numbers. We can also have geometric and topological embedding: * A circle or line can be embedded into the plane or higher dimensional space