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docs/src/man/fusioncats.md

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### $\mathsf{Fib}$ and $\mathsf{Ising}$
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Arguably the simplest fusion category besides the familiar groups or representations of groups is the Fibonacci fusion category. This contain 2 simple objects $1$ and $\tau$, with non-trivial fusion rule $\tau \otimes \tau = 1 \oplus \tau$. This fusion category is in fact **braided** as well, and actually **modular**.
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Another simple fusion category is the Ising category, commonly denoted $\mathsf{Ising}$. 3 simple objects form this category, namely $\{1, \psi, \sigma\}$, where $1$ and $\psi$ behave like the trivial charged representations of $\mathbb{Z}_2$, while $\sigma$ is the $\mathbb{Z}_2$ extension of this. The fusion rules reflect these: $1 \otimes \psi = \psi = \psi \otimes 1, \sigma \otimes X = \sigma = X \otimes \sigma$ for $X = 1, \psi$, and $\sigma \otimes \sigma = 1 \oplus \psi$. This fusion category is also **modular**. Both these modular fusion categories are already implemented in TensorKit.
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Another simple fusion category is the Ising category, commonly denoted $\mathsf{Ising}$. 3 simple objects form this category, namely $\{1, \psi, \sigma\}$, where $1$ and $\psi$ behave like the trivial charged representations of $\mathbb{Z}_2$, while $\sigma$ is the $\mathbb{Z}_2$ extension of this. The fusion rules reflect these: $1 \otimes \psi = \psi = \psi \otimes 1, \sigma \otimes X = \sigma = X \otimes \sigma$ for $X = 1, \psi$, and $\sigma \otimes \sigma = 1 \oplus \psi$. This fusion category is also **modular**. Both these modular fusion categories are already implemented in [TensorKitSectors](https://github.com/QuantumKitHub/TensorKitSectors.jl).

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