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just doesn't work


Helo,

I am writing a paper in Mathematica 4.0, and I found it to be very powerful
text editor. However, I encountered some deadly problems, which I cannot
solve. Thanks for any help!

1. How can I replace a symbol m with (4 a b c Pi Ro)/3 in expr

(4 a^3 b c K Pi Ro)/(15 r^3)

expr/.(4 a b c Pi Ro)/3 -> m
just doesn't work


2. How Can I 'bring out' a defined part from a sum of two terms.

e.g.

Bo[a^2 b c + a b c,a b c] - (would produce) - > a b c (a+1)

Collect[expr,{a,b,c}]
just doesn't work.


Borut, f.r.o.m. Slovenia




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