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Hilbert's Syzygy TheoremIn mathematics, Hilbert's syzygy theorem is a result of commutative algebra, first proved by David Hilbert in connection with the syzygy (relation) problem of invariant theory. Roughly speaking, starting with relations between polynomial invariants, then relations between the relations, and so on, it explains how far one has to go to reach a clarified situation. It is now considered to be an early result of homological algebra, and through the depth concept, be a measure of the non-singularity of affine space. A contemporary formal statement is the following. Let k be a field and M a finitely generated module over the polynomial ring - .
Hilbert's syzygy theorem then states that any free resolution of M has length at most n.
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