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S

sigma (lower case greek letter)

$$$\sigma$$$ gives $$\sigma$$

Sigma (upper case greek letter)

$$$\Sigma$$$ gives $$\Sigma$$

smiley

$$$~\unitlength{.6}~\picture(100){~~(50,50){\circle(99)}~ ~(20,55;50,0;2){+1$\hat\bullet}~~(50,40){\bullet}~~(50,35){\circle(50,25;34)}~ ~(50,35){\circle(50,45;34)}}$$$

square bracket

  • Synatx: \left[...\right]
  • Ex.: $$$\left[a,b\right]$$$ gives $$\left[a,b\right]$$

square root

  • $$$\sqrt{a}$$$ or $$$\sqrt~a$$$

subscript

  • The command character "_" triggers subscription of the following expression(s).
  • For more than one subscripted character put them in braces {...}.
  • Use font sizing commands for appropriate sizing.
  • Ex.:$$$x_1$$$ gives

$$x_1$$

  • Ex.:$$$a_{m+2n}$$$ gives

$$a_{m+2n}$$

  • Ex. (with specific sizing):

sum (summation)

  • General syntax for symbols with a kind of lower and upper limits:

\symbolname_{lowerexpression}^{upperexpression}

  • In general,

superscript

  • The command character "^" triggers superscription of the following expression(s).
  • For more than one superscripted character put them in braces {...}.
  • Use font sizing commands for appropriate sizing.
  • Ex.: $$$x^2$$$ gives

$$x^2$$

  • Ex.: $$$a^{m+2n}$$$ gives

$$a^{m+2n}$$

  • Ex. (with specific sizing): $$$x^{\small2}=a^{\small{m+2n}}$$$ gives

$$x^{\small2}=a^{\small{m+2n}}$$

  • Combine superscripting with subscripting (command character "_").
    Syntax: Expr_{subExpr}^{supExpr}.
  • Ex.: $$$A_{\small{i,j,k}}^{\small{-n+2}}$$$ gives

$$A_{\small{i,j,k}}^{\small{-n+2}}$$