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ok. now it works. I don't know why. But it works now.

same problem

ok. Now we have understood that the array environment has to be redefined. If someone want to post his redefinition here he is welcomed. Other suggestions don't answer the posted question, I think so. If I make one, I will post it here.

:'(

Hello,

here is a minimum example:

\documentclass[12pt]{article}
\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath}
\begin{document}
\begin{gather*}
\begin{array}{c}
\dfrac{a}{b}\\
\dfrac{c}{d}
\end{array}
\end{gather*}
\end{document}

There is no space between b ...

ok. Now I see my problem. The problem is that I confused gather with array. I will open a new thread with the real topic "vertical spacing array".
How can I delete this thread?

@Johannes_B
My problem is:
There should be a variable/constant like \minimumVerticalDistanceBetweenTwoCharacters used by gather to set the minimum vertical distance between two characters. And I want to change that variable/constant. That variable/constant could exist just like \arraystretch is ...

@cgnieder
What do you mean by not being precise enough? I was very precise enough. Maybe my English is not good. You have to read my first question and then you can see that I want to change the minimum vertical distance between two lines globally . I gave a minimum example and I gave a "maximum ...

The people in this forum have no idea about LaTeX! I hate this forum!

Here is the promised minimum example:

\documentclass[12pt]{article}
\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath}

\begin{document}
\begin{gather*}
\begin{array}{rl}
\begingroup
\renewcommand*{\arraystretch}{6.0}
\begin{array}{c}
\dfrac{a}{b \cdot \dfrac{a}{b ...