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        ITensor
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      High-performance tensor software <br/>inspired by tensor diagrams
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    <p class="title is-4">Code Examples</p>

    <p>Contracting two ITensors</p>

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        <pre class="has-background-black-ter"><code class="has-text-white-ter">C = A * B</code></pre>
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    <p>Factoring an ITensor</p>

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        <pre class="has-background-black-ter"><code class="has-text-white-ter">U,S,V = svd(T,i,j)</code></pre>

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    To view more code examples, <a href="/examples/">click here</a>.
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    <p class="title is-4">Installing</p>

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    The Julia version of ITensor (recommended) is easy to install through the Julia package manager:
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    <pre class="p-3 has-background-black-ter"><code class="has-text-white-ter">$ julia
<span style="color:#64CE91;">julia></span> ]
<span style="color:#528CE3;">pkg></span> add ITensors</code></pre>
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    <br/>

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    <br/>
    To install other packages such as ITensorMPS, follow the same steps just replacing "ITensors" with the package name.
    </p>

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    For the C++ version of ITensor see <a href="/docs.cgi?vers=cppv3&page=install">C++ installation instructions</a>.
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    To learn more about which version may be best for you to use and why,
    please <a href="https://docs.itensor.org/ITensors/stable/faq/JuliaAndCpp.html">read this FAQ page</a> about Julia versus C++ ITensor.
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    <p class="title is-4">What Makes ITensor Unique?</p>

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        <p class="title is-5">Intelligent Indices</p>
        <p>
        The indices of an ITensor have unique identities. When contracting two ITensors,
        matching indices "find" each other and contract automatically.
        Adding two ITensors is literally as easy as A+B. Groups of ITensors can
        be arranged into networks which know their topology.
        </p>
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        <img width="240px" src="/img/itensor_06.gif"/>
        <p class="title is-5">Quantum Number Conserving ITensors</p>
        <p>
        ITensors can be quantum number conserving (invariant under group symmetries)
        by storing block-sparse data and other information. Quantum number conserving 
        ITensors are nearly as easy to use as regular, dense ITensors.
        </p>
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        <p class="title is-5">Quantum Physics Tools</p>
        <p>
        Easily turn human-readable sums of operators into a compressed 
        MPO tensor network, a quantum circuit, and more. 
        These intermediate formats can be used to find ground states, 
        perform real-time or imaginary-time evolution, and other tasks.
        </p>
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        <img width="240px" src="/img/itensor_02.gif"/>
        <p class="title is-5">MPS and MPO Algorithms</p>
        <p>
        ITensor includes a full set of algorithms involving matrix product state (MPS) 
        and matrix product operators (MPO), such as state-of-the-art 
        <a href="https://docs.itensor.org/ITensorMPS/stable/tutorials/DMRG.html">DMRG</a>
        and 
        <a href="https://docs.itensor.org/ITensorMPS/stable/tutorials/MPSTimeEvolution.html">time-evolution codes</a>, and algorithms for summing, multiplying, 
        and optimizing MPS and MPOs.
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