MathGroup Archive 2005

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Pattern matching in functions


Hi,

I would like to find subexpressions using Cases.
In the following case, I expected to find a[b] and a[c] and therefore
get {b,c} as the result. However, I get {l,l}.
What happens and how can I solve this?

Cases[l^4*a[b][l] + l*a[c][l], x_a[y_] -> y, {0, Infinity}]

Thanks,
Max


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