【摘要】 本文给出了一个环R,使得对于任意二自然数n和m,均有R(n)≌R(m)更多还原

【Abstract】 It is well known that the R is a commutative ring, .R(n)~R(m) implies m = n where the R(m), R(n) are two free modules over R. But in general this result is not true again.In this note, we give a ring R. and two free modules R(n) and R(m) over R, for any distinct integers m and n teen we have R(n)~R(m).更多还原