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Exercise 2. Show that if R is a ring and a R then a0 = 0a = 0. ... Hint: consider a(0 0), andmake use of the negative (a0).). More definitions An identity element in a ring R is an element e R such that ea = ae = a forall
www.maths.usyd.edu.au/u/bobh/UoS/MATH3902/r/a1npdf.pdf
2.20). is a fundamental domain for the action of W on the Tits cone. ... 6]). Identify 1 Waffwith the fundamental alcove. A0 ={x hR. 〈x,αi〉> 0 for all 0!
www.maths.usyd.edu.au/u/jamesp/4.pdf