With MathMl, we can specify matrices with an mtable with rows in mtr elements and entries in mtd elements.
<!doctype html> <html> <head> <title>XoaX.net's MathML: A Matrix Example</title> </head> <body> <p>A 2 by 3 matrix <math display="block"> <mi>M</mi> <mo>=</mo> <mo>[</mo> <mtable> <mtr> <mtd><mn>1</mn></mtd> <mtd><mn>2</mn></mtd> <mtd><mn>3</mn></mtd> </mtr> <mtr> <mtd><mn>4</mn></mtd> <mtd><mn>5</mn></mtd> <mtd><mn>6</mn></mtd> </mtr> </mtable> <mo>]</mo> </math> </p> </body> </html>
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