B bds_css New member Joined Feb 9, 2009 Messages 1 Feb 9, 2009 #1 Given that element a is a group and a^10=a^4, express a^-1 as a positive power. I am trying to wrap my mind around this. So, the order of a, |a|=10 and |a|=4. I know that |a|=|a^-1| but how to express it as a positive power???
Given that element a is a group and a^10=a^4, express a^-1 as a positive power. I am trying to wrap my mind around this. So, the order of a, |a|=10 and |a|=4. I know that |a|=|a^-1| but how to express it as a positive power???
D daon Senior Member Joined Jan 27, 2006 Messages 1,284 Feb 9, 2009 #2 Multiply both sides by \(\displaystyle a^{-5}\)
