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B\"ottcher coordinates
A well-known theorem of B\"ottcher asserts that an analytic germ
f:(C,0)->(C,0) which has a superattracting fixed point at 0, more precisely of
the form f(z) = az^k + o(z^k) for some a in C^*, is analytically conjugate to
z->az^k by an analytic germ phi:(C,0)->(C,0) which is tangent to the identity
at 0. In this article, we generalize this result to analytic maps of several
complex variables
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