![]() And to represent this syntax, you need to use a subscript with this command. Advantages: It extends several matrix environments at the same time (matrix, pmatrix, bmatrix, Bmatrix, vmatrix, Vmatrix).The names and meanings of those environments remain (not apmatrix etc.). I would extend an internal macro of amsmath using an optional argument. You may have noticed that different text, number is written under the underbrace. If you build your own environment using array, youre on the safe side. here and here) due to spacing discrepancies. Knowing simple shortcut like how to insert matrix brackets in Word can save a lo. As commented by egreg eqnarray should be avoided (see e.g. Typing matrix in Ms Word can be cumbersome if you don't do it the right way. Multiple lines underbrace expression in LaTeX. UPDATE with align.Thanks to cmhughes's advice I've replaced eqnarray with alignand & with &.ADDED. Just remember that the syntax goes \left, symbol for the opening bracket, \right, symbol for the closing bracket. However, the aunderbrace command has been used for the abraces package. For our purposes, “brackets” refers to (parentheses),, - the syntax of the \left and \right commands can start to look a little confusing, especially when combined with other commands. First the basic environments which could be used for a matrix, all of them are provide by usepackage amsmath.
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