Hi José,
Just to say, I'm thoroughly enjoying your book.
One thing confused me though: on pages 78 and 79, you define a list
list = {{a1, b1, c1}, {a2, b2, c2}, {a3, b3, c3}}
and then use replacement
list /. {a, b, c_} -> a/(b + c)
But this produces
{a1/(a2 + a3), b1/(b2 + b3), c1/(c2 + c3)}
Not
{a1/(b1 + c1), a2/(b2 + c2), a3/(b3 + c3)}
as suggested should be the answer.
From my limited knowledge, I think it is because it sees a, b and c being the three lists inside rather than the elements of each list.
Am I on the right track?
Also, from a bit of research, I think this would cure the problem:
list /. {a_Symbol, b_Symbol, c_Symbol} -> a/(b + c)
Thank you for your time.
Paul