Mathematics – Rings and Algebras
Scientific paper
2005-02-17
Mathematics
Rings and Algebras
15 pages
Scientific paper
A planar monomial is by definition an isomorphism class of a finite, planar, reduced rooted tree. If $x$ denotes the tree with a single vertex, any planar monomial is a non-associative product in $x$ relative to $m-$array grafting. A planar power series $f(x)$ over a field $K$ in $x$ is an infinite sum of $K-$multiples of planar monomials including the unit monomial represented by the empty tree. For every planar power series $f(x)$ there is a universal differential $d f(x)$ which is a planar power series in $x$ and a planar polynomial in a variable $y$ which is the differential $d x$ of $x$. We state a planar chain rule and apply it to prove that the derivative $\frac{d}{dx}(Exp_k(x))$ is the $k-$ary planar exponential series. A special case of the planar chain rule is proved and it derived that the planar universe series $Log_k (1+x)$ of $Exp_k(x)$ satisfies the differential equation $\biggl((1+x) \frac{d}{dx}\biggl)(Log_k(1+x)) = 1$ where $(1+x) \frac {d}{dx}$ is the derivative which when applied to $x$ results in $1 + x.$
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