MathJax fast test
this is :
$$ lim_{1to+infty}P(|frac{1}{n}sum_i^nX_i-mu|<epsilon)=1, i=1,…,n $$
$$
begin{eqnarray}
nablacdotvec{E} &=& frac{rho}{epsilon_0}
nablacdotvec{B} &=& 0
nablatimesvec{E} &=& -frac{partial B}{partial t}
nablatimesvec{B} &=& mu_0left(vec{J}+epsilon_0frac{partial E}{partial t} right)
end{eqnarray}
$$
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