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0

Apparently the problem was that the mathematical arrangements of cases and the symbols <, > came into conflict with \usepackage{fouriernc} Removing the package the problem is solved.

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I would not uses cases for this, which is better suited for use on the right-hand side of an equation. Rather I would use an aligned block, aligning on the equality signs, and enclosed in a \left\{ ... \right. pair to produce the left brace. MadyYuvi's suggestion to use \vdotswithin is also a good aid. \documentclass{article} \usepackage{mathtools} \...

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Use \vdotswithin tag which comes along with the package mathtools, and the codes are follows: \documentclass{book} \usepackage{mathtools} \begin{document} \begin{cases} u_{1,t}=\nabla\cdot D(u_{1})\nabla u_{1,t}+f_1(c_1, \dots, c_m, u_1, \dots, u_n)\\ \vdotswithin{u_{n,t}=\nabla\cdot D(u_{n})\nabla u_{n,t}+f_2(c_1, \dots, c_m, u_1, \dots, ...

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With use of math environment cases* from the mathtools package: \documentclass{article} \usepackage{mathtools} \begin{document} \begin{align} \phi & = \begin{cases*} 1, & if $u\geq 0$ \\ 0, & otherwise. \end{cases*} \\ f(x) & = \begin{cases*} x^2 & : $x=0$ \\ x^3 & : $y\geq$ ...

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