bug in cross product
- To: mathgroup
- Subject: bug in cross product
- From: mrk at athena.Princeton.EDU
- Date: Fri, 24 Mar 89 15:53:33 CST
There is a bug in the Mathematica Package CrossProduct.m. Following is a sample
session illustrating the problem:
In[1]:= <<CrossProduct.m
In[2]:= Cross[a,b]^2
2
Out[2]= -a . b + a . a b . b
Note that this is incorrect (in the first term the a should be squared).
If you do the following the answer comes out correct:
In[3]:= Cross[a,b] . Cross[a,b]
Out[3]= -a . (b a . b) + a . (a b . b)
Mark Dragovan
Physics Dept, Princeton University
mrk at athena.princeton.edu