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Michael Retchin edited Math.tex
over 9 years ago
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\section{Math}
\hspace{20 mm}Each tumor was modeled as a self-avoiding polygon (SAP). A SAP is a closed shape whose perimeter consists of a random walk path which does not visit the same site more than once, also known as a self-avoiding walk (SAW). A SAW of length $N$ in a $2$-dimensional lattice ${\Bbb R}$, starting at point $x$, is defined as a path
$ω=(ω_0, ω_1, ..., ω_n)$, where $ω_j ∈ {\Bbb R}$, $ω_0=x$, $|ω_j − ω_{j−1}| = 1$, $j = 1, 2, . . . , n$, and $ω_i \neq ω_j$ for $i \neq j$, and $0 ≤ i < j ≤ n$.
\begin{equation}
$ω=(ω_0, ω_1, ..., ω_n)$
\end{equation}
In this case, $ω_j ∈ {\Bbb R}$, $ω_0=x$, $|ω_j − ω_{j−1}| = 1$, $j = 1, 2, . . . , n$, $ω_i \neq ω_j$ for $i \neq j$, and $0 ≤ i < j ≤ n$. In other words,
The equation defines at which position the path will lie after $n$ number of steps.
\hspace{2000 mm} To model the distribution of $S_{n}$ we need to set it to $x$ and set the number of steps to the right and left by $r$ and $l$, respectively. Given this, $x = r - l$ and $n$, the total number of steps actually executed, $= r + l$. By simply solving for $r$ and $l$ we deduce that $r = (1/2)(x+n)$ and $l = (1/2)(n-x)$.