Highlight code test

x=a
Error: object 'a' not found
b=c
c=5
b
function (...) .Primitive("c")
> data(Titanic)
> Titacnic
#Error: object 'Titacnic' not found
Titanic
, , Age = Child, Survived = No

Sex
Class Male Female
1st 0 0
2nd 0 0
3rd 35 17
Crew 0 0

, , Age = Adult, Survived = No

Sex
Class Male Female
1st 118 4
2nd 154 13
3rd 387 89
Crew 670 3

, , Age = Child, Survived = Yes

Sex
Class Male Female
1st 5 1
2nd 11 13
3rd 13 14
Crew 0 0

, , Age = Adult, Survived = Yes

Sex
Class Male Female
1st 57 140
2nd 14 80
3rd 75 76
Crew 192 20

2*3

\frac{-b\pm\sqrt{b^2-4ac}}{2a}

\sum_a^b\alpha^{\beta}

end