Richard Gobeli

Make predefine coframes compatible to Maxima coframes

The following is the correct fix for the frame bracket function. It comes from the itensor package and it does give the correct result. (%i20) ishow(rename(ifb([a,b,c]))); (%o20) (ifri([a,%1],[],%2)-ifri([a,%2],[],%1))ifr([b],[%1])ifr([c],[%2]) This is what I programed in my local version. Which works. frame_bracket(fr,fri,diagframe):=block ( for a thru dim do for b thru dim do for c thru dim do fb[a,b,c]:sum(sum((diff(fri[a,e%],ct_coords[f%])-diff(fri[a,f%],ct_coords[e%])) fr[b,e%]fr[c,f%],e%,1,dim),f%,1,dim)...

Thanks for the quick reply. What about the last paragraph when using the minus index. Is diff completely compatible with that method? I have also a long demo from the Macsyma program, it probably assumes the metric will work. I was trying to do all of the demo lines in Maxima. I have come across some snags. Where would it best to ask you help on them? Regards,

Variation of rank 1 upper tensor by rank 1 lower tensor is not done

Pattern Matching is based on single units

Here is a print out in WxMaxima to be like Macsyma.

This bug report is replaced by : https://sourceforge.net/p/maxima/bugs/4438/ Please close.

When using a frame field the icc2 or msc symbol is incorrect.