Help:Displaying a formula
x n + 1 = x n ( x n + 1 ) ( x n + 2 ) ( x n + 3 ) + 1 {\displaystyle x_{n+1}={\sqrt {x_{n}(x_{n}+1)(x_{n}+2)(x_{n}+3)+1}}}
x_{n+1}=\sqrt{x_n(x_n+1)(x_n+2)(x_n+3)+1}
{\displaystyle }
x^2+y^2
∂ ρ ∂ t + ∇ ⋅ J = 0 {\displaystyle {\frac {\partial \rho }{\partial t}}+\nabla \cdot \mathbf {J} =0} .
∂ ρ ∂ t + ∇ ⋅ ρ v = 0 {\displaystyle {\frac {\partial \rho }{\partial t}}+\nabla \cdot \rho \mathbf {v} =0}