Matrices and Arrays
{n \choose 2} \displaystyle{n \choose 2} {n \brack 2} \displaystyle{n \brack 2} {n \brace 2} \displaystyle{n \brace 2} f(x)=\cases {
x^2+1&\text{if $x<0$}\cr
1-x&\text{otherwise}
}f(x)=\cases{x^2+1&\text{if $x<0$}\cr 1-x&\text{otherwise}} \pmatrix{1& 0\\ 0& 1} \pmatrix{1& 0\\ 0& 1} \left[\matrix{a^2-b^2& -1\\ 1& 2ab}\right] \left[\matrix{a^2-b^2& -1\\ 1& 2ab}\right]
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