In algebraic geometry, the dimension of an algebraic varietyV is defined, informally speaking, as the number of independent rational functions that exist on V. So, for example, an algebraic curve has by definition dimension 1. That means that any two rational functions F and G on it satisfy some polynomial relation P(F,G) = 0. That implies that F and G are constrained to take related values (up to some finite freedom of choice): they cannot be truly independent.
For the function field even to be defined, V here must be an irreducible algebraic set; in which case the function field (for an affine variety) is just the field of fractions of the co-ordinate ring of V. It is easy to define by polynomials sets that have 'mixed dimension': a union of a curve and a plane in space, for example. These fail to be irreducible.
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