希臘字母和 tikz

Question

我必須插入希臘字母來代替 V_0 和 C_t，但似乎沒有任何效果。有什麼提示嗎？

\documentclass[11pt,a4paper]{article}

\usepackage{tikz}

% tikzstyle è deprecato: 
% http://tex.stackexchange.com/q/52372/13304
\tikzset{bag/.style={text width=2em, text centered}}% align=center

\begin{document}

\begin{tikzpicture}
\draw[|-stealth] (0,0) -- (8,0) node[right]{$t$};

\foreach \x/\testosopra/\testosotto in {0/V_0/{0},7/C_t/t}{
 \draw(\x,0.1)--(\x,-0.1);
 \node[above,font=\scriptsize]at (\x,0.1) (\testosopra) {$\testosopra$};
 \node[below,font=\scriptsize]at (\x,-0.1) {$\testosotto$};
}


\end{tikzpicture}

\end{document}

Answer 1

問題出(\testosopra)在\draw宏觀。我認為（不知道tikz）這是一個節點的內部標籤，結論是內部標籤不能是希臘宏。在這裡，我替換(\x)為(\testosopra)，因為允許使用“0”和“7”等內部標籤。

這樣做，我沒有問題然後V_0用\alpha和C_t替換\beta。

\documentclass[11pt,a4paper]{article}

\usepackage{tikz}

% tikzstyle è deprecato: 
% http://tex.stackexchange.com/q/52372/13304
\tikzset{bag/.style={text width=2em, text centered}}% align=center

\begin{document}

\begin{tikzpicture}
\draw[|-stealth] (0,0) -- (8,0) node[right]{$t$};

\foreach \x/\testosopra/\testosotto in {0/\alpha/{0},7/\beta/t}{
 \draw(\x,0.1)--(\x,-0.1);
 \node[above,font=\scriptsize]at (\x,0.1) (\x) {$\testosopra$};
 \node[below,font=\scriptsize]at (\x,-0.1) {$\testosotto$};
}


\end{tikzpicture}

\end{document}