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rings.m2
R = QQ[a,b,c] f = R_{1,2,3} S = R/(a^3+b^3+c^3) g = R_{1,2,3} h = S_{1,2,3} assert( f == g ) assert( class f === R ) assert( class g === R ) assert( class h === S ) --Date: Fri, 16 Apr 2004 11:43:07 +0000 (UTC) --From: Ben Richert <brichert@polymail.cpunix.calpoly.edu> --To: dan@math.uiuc.edu --Subject: possible M2 bug? --Content-Type: TEXT/PLAIN; charset=US-ASCII -- --Dan, -- --I came across the following: -- --Macaulay 2, version 0.9.2 ----Copyright 1993-2001, D. R. Grayson and M. E. Stillman ----Singular-Factory 1.3c, copyright 1993-2001, G.-M. Greuel, et al. ----Singular-Libfac 0.3.3, copyright 1996-2001, M. Messollen -- --i1 : r=QQ[A,B,a,b,n][p] -- --o1 = r -- --o1 : PolynomialRing -- --i2 : n*p^3+(A-B)*(p+1)^3+(b-a)*(p+2)^3+(p+3)^3*((p+2)*(p+1)/2-3*n+B) -- --Process M2 segmentation fault -- --It's mad about the (p+2)*(p+1)/2, so if you switch to 1/2*(p+2)*(p+1) --things work fine. Just thought I'd let you know. -- --Ben Richert R = QQ[A,B,a,b,n][p] f = n*p^3+(A-B)*(p+1)^3+(b-a)*(p+2)^3+(p+3)^3*((p+2)*(p+1)/2-3*n+B) f = n*p^3+(A-B)*(p+1)^3+(b-a)*(p+2)^3+(p+3)^3*((p+2)*(p+1)//2-3*n+B) R = QQ[x] x/2 x//2 end -- Local Variables: -- compile-command: "make -C $M2BUILDDIR/Macaulay2/packages/Macaulay2Doc/test rings.out" -- End:
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