2.11. Let f e r(V), V a variety c A". Define 1 G(f) = {(a1,..., An, An+1) € A"+ |(a1,..., an) E V and an+1 = f(aj,..., an)}, the graph of f. Show that G(f) is an affine variety, and that the map (a1,..., an) - (a1,..., an, f (a1,..., an)) defines an isomorphism of V with G(f). (Projection gives the inverse.)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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2.11. Let f e r(V), V a variety cA". Define
G(f) = {(a1,….., An, An+1) E A"*' |(a1,..., an) E V and an+1 = f(a1,..., An)},
the graph of f. Show that G(f) is an affine variety, and that the map (a1,..., an) –
(a1,..., an, f(a1,..., an)) defines an isomorphism of V with G(f). (Projection gives
the inverse.)
Transcribed Image Text:2.11. Let f e r(V), V a variety cA". Define G(f) = {(a1,….., An, An+1) E A"*' |(a1,..., an) E V and an+1 = f(a1,..., An)}, the graph of f. Show that G(f) is an affine variety, and that the map (a1,..., an) – (a1,..., an, f(a1,..., an)) defines an isomorphism of V with G(f). (Projection gives the inverse.)
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