By Hiram Paley

ISBN-10: 0030549655

ISBN-13: 9780030549656

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N. Proposit ion ~(Q) is a normal irreducible projective algebraic V is invertible are equivalent: A pQ of a finite-dimensional is called a pseudoreflection the s}~metric algebra of (ii) These pseudoreflections g • G x• V . (i) Example. ) of G-invariant Then the following An element variety; and in A k. = BG , 39 (ii) all singularities lar, (iii) • (Q) of P(Q) are cyclic quotients singularities (in particu- is a V-variety); a nonsingular ~(Q) is isomorphic For the proof of property to ~r . 2. 1.

Proposition. S-module if and only if i = r. 2. For any subset Notice that Theorem. IQ0,r Let j c 0,r = Q = {0 .... ,r} in our old notations. h(j ,i;n) = dimkHJ (~ ,--i ~p (n)) . ,r n # 0, Put Qj the sum Z jeJ an = dimeS(Q) n . qj. Then - h(0, i-l;n) , h(i,i;n) = 0, h(r,i;n) = Proof. 1 we obtain the exact sequence 0 ÷ H + ÷ (n)) n 7z ÷ ÷ 0 and an isomorphism J H{m}(as) ÷ n~m Hi-1 ( ~ , ~ ( n ) ) . 1). So, we get all the assertions #J=i except the last one. 1 and obtain that r i dimkH (is(n)) = #J=r+l-i a-n- 1QJ Using this sequence and preceeding results we obtain the last equality.

1). So, we get all the assertions #J=i except the last one. 1 and obtain that r i dimkH (is(n)) = #J=r+l-i a-n- 1QJ Using this sequence and preceeding results we obtain the last equality. 3. Corollary. 0. 4. H0(~,~(n)) = 0, if n

### A First Course in Abstract Algebra by Hiram Paley

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