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An "Embedding" is a 1-1 function that takes the domain into the destination space, preserving any appropriate structure. In a sense it is a copy of the "source" in the "destination." * 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 number can be embedded into the real numbers, and * the real numbers can be embedded into the complex numbers.