Examples from the TeXbook (Chapter 18, continued)
TeXbook p. 171|-x| = |+x| \qquad \left|-x\right| = \left|+x\right| \qquad \lfloor -x\rfloor = -\lceil+x\rceil
TeXbook p. 172x_1 + \cdots + x_n\qquad {\rm and} \qquad (x_1,\ldots,x_n)
x_1 = \cdots = x_n = 0 \qquad A_1 \times \cdots \times A_n \qquad f(x_1,\ldots,x_n)
x_1x_2 \ldots x_n \qquad (1-x)(1-x^2)\ldots(1-x^n) \qquad n(n-1)\ldots (1)
TeXbook p. 174\{a,b,c\} \qquad \{1,2,\ldots,n\} \qquad {\{\rm red,white,blue\}} \qquad \{\,x\mid x > 5\,\} \qquad \{\,x:x > 5\,\}
\bigl\{\,\bigl(x,f(x)\bigr)\bigm| x\in D\,\bigr\} \qquad \bigl\{\,x^3\bigm| h(x)\in\{-1,0,+1\}\,\bigr\}
TeXbook p. 176\overbrace{x+\cdots+x\,}^{k\rm\;times} \qquad \underbrace{x+y+z\,}_{>\,0}
A = \pmatrix{x-\lambda & 1 & 0\cr 0 & x-\lambda & 1\cr 0 & 0 & x-\lambda\cr} \qquad\qquad \left\lgroup\matrix{a&b&c\cr d&e&f}\right\rgroup \left\lgroup\matrix{u&x\cr v&y\cr w&z}\right\rgroup
TeXbook p. 177A = \pmatrix{a_{11} & a_{12} & \ldots & a_{1n}\cr a_{21} & a_{22} & \ldots & a_{2n}\cr \vdots & \vdots & \ddots & \vdots\cr a_{m1} & a_{m2} & \ldots & a_{mn}} \qquad\qquad \pmatrix{y_1\cr\vdots\cr y_k}
TeXbook p. 178
A small matrix like 1\,1\choose 0\,1 or a similar one like \bigl({a\atop l}{b\atop m}{c\atop n}\bigr)
TeXbook p. 179
2^{\raise1pt n}\hbox{ rather than }2^n \qquad {\rm Fe_2^{+2} Cr_2^{\vphantom{+2}}O_4^{\vphantom{+2}}} \hbox{ rather than } {\rm Fe_2^{+2} Cr_2 O_4}
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