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Benedict Irwin edited Dirac notation.tex
over 9 years ago
Commit id: bb010b52ba0117dac222042edc431d4f72630079
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\end{equation}
An example being \begin{equation}
[\ketbra{3}{2}+\ketbra{5}{3}+\ketbra{7}{5}]\ket{5}=\ket{7}
\end{equation}
Which although it sounds rediculous. When interpreted as \begin{equation}
\frac{6+15+35}{5}=7
\end{equation}
It is clear there is something to this concept! However, it breaks
\begin{equation}
[\ketbra{3}{2}+\ketbra{5}{3}]\ket{3}=\ket{7} \ne \ket{5} \;...
\end{equation}
We have then \begin{equation}
\ketbra{3}{2} \ketbra{5}{3} = \ketbra{7}{3}
\end{equation}
We have not noticed the link between primes seperated by more than one!
We have the following picture in the matrices...
\begin{equation}
\begin{bmatrix}
0 & 0 & 0 & 0 \\ 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 0 \end{bmatrix}
\begin{bmatrix} 0 \\ 1 \\ 0 \\ 0 \end{bmatrix}
=\begin{bmatrix} 0 \\ 0 \\ 1 \\ 0 \end{bmatrix} \\
\begin{bmatrix}
0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \end{bmatrix}
\begin{bmatrix} 0 \\ 1 \\ 0 \\ 0 \end{bmatrix}
=\begin{bmatrix} 0 \\ 0 \\ 0 \\ 1 \end{bmatrix} \\
\end{equation}
The next version \begin{equation}
[\ketbra{3}{2}+\ketbra{5}{3}+\ketbra{7}{5}+\ketbra{11}{7}]\ket{7}=\ket{19}
\end{equation}
Which is also prime. But...
The next version \begin{equation}
[\ketbra{3}{2}+\ketbra{5}{3}+\ketbra{7}{5}+\ketbra{11}{7}+\ketbra{13}{11}]\ket{11}=2\otimes2\otimes2\otimes2=16
\end{equation}
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In fact there should exist an algorithm to find the next prime using this method.
But not with the broken form...
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However the short comings of this notation are that they do not express higher dimensional terms. How does one express a cubic array, i.e a number with three prime factors?