GLOBAL DIMENSION OF TILED ORDERS OVER A DISCRETE VALUATION RING
GLOBAL DIMENSION OF TILED ORDERS OVER A DISCRETE VALUATION RING
复制标题
离散估值环上平铺订单的全球规模
DOI:
10.1090/s0002-9947-1974-0349729-3
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发表时间:
1974
影响因子:
1.3
通讯作者:
Vasanti A. Jategaonkar
中科院分区:
文献类型:
--
作者:
Vasanti A. Jategaonkar
Let R be a discrete valuation ring with maximal ideal m and the quotient field K. Let A = (mA"j) C M_(K) be a tiled R-order, where Xii e Z and Ai = 0 for 1 : i s,n. The following results are proved. Theorem 1. There are, up to conjugation, -only finitely many tiled R-orders in M,(K) of finite global dimension. Theorem 2. Tiled R-orders in M"(K) of finite global dimension satisfy DCC. Theorem 3. Let A C Mn(R) and let r be obtained from A by replacing the entries above the main diagonal by arbitrary entries from R. If r is a ring and if gl dim A 0 for all i, j (cf. Lemma 1.1). One of the main results in this paper shows that if A = (m in) C Mn(R) is a tiled R-order of finite global dimension, then Ai, < n 1 for all i, j; hence it follows that there are only finitely many tiled R-orders in M"(R) of finite global dimension. Using this we show that if S1, S2, ..., Sh is a finite family of Presented to the Society, January 12, 1972; received by the editors June 15, 1973. AMS(MOS) subject classifications (1970). Primary 16A60.