Which font produces 1 and l that look similar in math mode?

Question

I am looking for a font that produces number 1 and letter l that look similar (with naked eyes) in math mode. Is there such font?

documentclass[preview,border=12pt,varwidth]{standalone}
usepackage{amsmath}
begin{document}
[
    f(x)=
    begin{cases}
        frac{x^2+2kx+l}{x+1} & x<-1
        x^2+2 & xgeq -1
    end{cases}
]
Find $k$ such that $f(x)$ is continuous at $x=-1$. 
end{document}

If I can make the letter l look similar to number 1 then there will be many students get trapped. :-)

Who Save Me Save Entire World · Accepted Answer

I am still waiting for other better answer. Here is my own solution.
documentclass[preview,border=12pt,varwidth]{standalone}
usepackage{amsmath}
begin{document}
[
    f(x)=
    begin{cases}
        frac{x^2+2kx+mathrm{l}}{x+1} & x<-1
        x^2+2 & xgeq -1
    end{cases}
]
Find $k$ such that $f(x)$ is continuous at $x=-1$. 
end{document}

Edit
Feel free to add other good ones.
documentclass[border=12pt,12pt,varwidth]{standalone}
usepackage{amsmath}
begin{document}
Evaluate 
$displaystyle
lim_{xto mathrm{l}}frac{x^2-mathrm{l}}{x-1}
$.
end{document}

Which font produces 1 and l that look similar in math mode?

One Answer

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