
            comment:
              '<kbd>For</kbd> is upright, <kbd>x</kbd> is italics (math variable)',
            latex: '\\[ \\text{For $|x|<1$}. \\]',
          },
          {
            title:
              '&dollar;&dollar;...&dollar;&dollar; inside &dollar;...&dollar;',
            comment: 'Only <kbd>\\prod</kbd> is in <kbd>displaystyle</kbd>',
            latex: `\\prod_0^n  $\\sum_0^n $$ \\sum_0^n $$ $ `,
          },

          {
            title:
              'Math mode shift and set: <kbd>