# How can i put in a limit a letter with undescore letter?

well, i have to write the limit in latex, but i don't know why i can't write un underscore caracter in the limit argument.

• Welcome to TeX.SX! Did you try \lim_{v\rightarrow v_{\varepsilon}}? – egreg Jun 29 '15 at 14:57
• i'll write something like that \lim_{V\to\V_varepsilon} \rho = \rho_A – Dylan Susat Jun 29 '15 at 14:57

You get an underscore with \_, but I do not think it's an underscore (too high). I suspect an arrow together with the "circ", which might be an triangle arrow head. The arrow version makes more sense in mathematics. The limes is calculated, when variable V converges to Vε.
\documentclass{article}
$\lim_{V\!\_ \circ V_\varepsilon} \quad\text{vs.}\quad \lim_{V\rightarrow V_\varepsilon}$