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Structured ring spectra and displays
Structured ring spectra and displays

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... (iii) Write the ring map corresponding to the Z-group map det : GLn → Gm , and use the irreducibility of det(tij ) over any field (proof?) to deduce that the only group scheme maps from GLn to Gm over a field are detr for r ∈ Z. (iv) What is the scheme-theoretic intersection of SLn and the diagonall ...
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... (1) Let R be a reduced commutative ring (no nonzero nilpotent elements). Classify all 1-dimensional commutative formal group laws over R which are polynomials. b a or G b m. (2) Give an example of a 1-dim polynomial group law over Z[]/2 which is not G (3) Show that formal group laws over R have fo ...
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... Proof. Let I be an ideal in R[X]. To prove I is finitely generated we assume it is not, so I 6= (0). We will construct a sequence in I recursively. Let f1 be any element of I with least degree. If we have f1 , . . . , fk in I then (f1 , . . . , fk ) 6= I since I is not finitely generated, so there i ...
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Commutative ring

In ring theory, a branch of abstract algebra, a commutative ring is a ring in which the multiplication operation is commutative. The study of commutative rings is called commutative algebra.Some specific kinds of commutative rings are given with the following chain of class inclusions: Commutative rings ⊃ integral domains ⊃ integrally closed domains ⊃ unique factorization domains ⊃ principal ideal domains ⊃ Euclidean domains ⊃ fields ⊃ finite fields
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