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    <title>form</title>
    <meta charset="utf-8"/>
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    <!-- These operators should have form "prefix" -->

    _<math><merror><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></merror></math>_
    _<math><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></math>_
    _<math><mphantom><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></mphantom></math>_
    _<math><mrow><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></mrow></math>_
    _<math><msqrt><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></msqrt></math>_
    _<math><mstyle><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">−</mo><mi>x</mi></mstyle></math>_

    <br/>

    _<math><merror><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></merror></math>_
    _<math><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></math>_
    _<math><mphantom><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></mphantom></math>_
    _<math><mrow><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></mrow></math>_
    _<math><msqrt><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></msqrt></math>_
    _<math><mstyle><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">+</mo><mi>x</mi></mstyle></math>_

    <br/>

    _<math><merror><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></merror></math>_
    _<math><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></math>_
    _<math><mphantom><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></mphantom></math>_
    _<math><mrow><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></mrow></math>_
    _<math><msqrt><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></msqrt></math>_
    _<math><mstyle><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">±</mo><mi>x</mi></mstyle></math>_

    <br/>

    _<math><merror><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></merror></math>_
    _<math><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></math>_
    _<math><mphantom><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></mphantom></math>_
    _<math><mrow><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></mrow></math>_
    _<math><msqrt><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></msqrt></math>_
    _<math><mstyle><mo form="prefix" lspace="0em" rspace="veryverythinmathspace">∓</mo><mi>x</mi></mstyle></math>_

    <br/>

    <!-- These operators should have form "infix" -->

    _<math><merror><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></merror></math>_
    _<math><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></math>_
    _<math><mphantom><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></mphantom></math>_
    _<math><mrow><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></mrow></math>_
    _<math><msqrt><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></msqrt></math>_
    _<math><mstyle><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">−</mo><mi>y</mi></mstyle></math>_

    <br/>

    _<math><merror><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></merror></math>_
    _<math><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></math>_
    _<math><mphantom><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></mphantom></math>_
    _<math><mrow><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></mrow></math>_
    _<math><msqrt><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></msqrt></math>_
    _<math><mstyle><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">+</mo><mi>y</mi></mstyle></math>_

    <br/>

    _<math><merror><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></merror></math>_
    _<math><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></math>_
    _<math><mphantom><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></mphantom></math>_
    _<math><mrow><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></mrow></math>_
    _<math><msqrt><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></msqrt></math>_
    _<math><mstyle><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">±</mo><mi>y</mi></mstyle></math>_

    <br/>

    _<math><merror><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></merror></math>_
    _<math><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></math>_
    _<math><mphantom><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></mphantom></math>_
    _<math><mrow><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></mrow></math>_
    _<math><msqrt><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></msqrt></math>_
    _<math><mstyle><mi>x</mi><mo form="infix" lspace="mediummathspace" rspace="mediummathspace">∓</mo><mi>y</mi></mstyle></math>_

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