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Showing content from https://webplatform.github.io/docs/mathml/elements/mmultiscripts below:

mmultiscripts · WebPlatform Docs

The MathML mmultiscripts element allows you to create tensor-like objects.

DOM Interface

mathml

These examples demonstrate a simple usage of the mmultiscripts element:

<math>

    <mmultiscripts>

        <mi>X</mi>      

        <mi>d</mi>      
        <mi>c</mi>      

        <mprescripts />
        <mi>b</mi>      
        <mi>a</mi>      

    </mmultiscripts>

</math>

<math>

    <mmultiscripts>

        <mi>X</mi>      

        <none />        
        <mi>c</mi>      

        <mprescripts />
        <mi>b</mi>      
        <none />        

    </mmultiscripts>

</math>

MathML 3.0

W3C Recommendation

In a descriptive way tensors are multidimensional matrices (mathematical imprecise but exemplified). The degree of a tensor depends on the dimensionality of a representative array. For example, a number is a 0-dimensional array, or a 0th-order tensor. A 1-dimensional array (e.g. vectors) is a 1st-order tensor and so 2nd-order tensors are needed to represent square matrices. To learn more about the mathematical background of tensors refer to the entry on Wikipedia.

MathML uses a special syntax to describe subscripts and superscripts for both, postscripts and prescripts, attached to a base expression:

<mmultiscripts>
    base
     (subscript superscript)*
     [ <mprescripts/> (presubscript presuperscript)* ]
</mmultiscripts>

After the base expression you can specify a postsubscript and a postsuperscript. Prescripts are optional and are separated by the empty tag <mprescripts/>. In addition you are able to use <none/> as a placeholder for empty positions.

subscriptshift

The minimum space by which to shift the subscript below the baseline of the expression, as a CSS length.
superscriptshift

The minimum space by which to shift the superscript above the baseline of the expression, as a CSS length.

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