change the vertical distance between lines inside an enumerate

Question

I want to know how to use a command like \enumerate but more compact. Here's an example:

I'm writing this problem using \enumerate. In this way:

Let $\sP$ be a property of morphisms of schemes such that:

\begin{enumerate}[(a)]

\item A closed immersion has $\sP$
\item A composition of two morphisms having $\sP$ has $\sP$

\end{enumerate}

And this is how it looks:

A simple way to solve the problem is to avoid enumerate and use the command \newline. I want to know if there is a better solution for this using some enumerator, itemize or related command. (I always prefer to have all my problems indexed via commands and not by hand)

EDIT: I put minimal examples.

Answer 1

This could be achieved either using enumerate package, setting itemsep value or for example with the more sophisticated enumitem package, generally (\setlist macro) or individually at the right position. However, it might be necessary, to reduce the topsep value which is responsible for vertical spacing above (and below) the whole enumeration block.

(The shortlabels option to enumitem allows to emulate enumerate, the first value in the key value list of the enumerate options is then interpreted as the labeling style as in enumerate. This and some exaggerated values are shown for demonstration purposes in the second example.

\documentclass{article}


\newcommand{\sP}{\mathcal{P}}

\usepackage[shortlabels]{enumitem}
\setlist[enumerate,1]{label={(\alph*)},noitemsep,topsep=0.5pt}
\begin{document}
\noindent Let $\sP$ be a property of morphisms of schemes such that:
\begin{enumerate}
\item A closed immersion has $\sP$
\item A composition of two morphisms having $\sP$ has $\sP$
\end{enumerate}
\hrule
\vskip\baselineskip % or some other spacing here

\noindent Let $\sP$ be a property of morphisms of schemes such that: (Exaggerated)
\begin{enumerate}[(A),itemsep=20pt,topsep=50pt]
\item A closed immersion has $\sP$
\item A composition of two morphisms having $\sP$ has $\sP$
\end{enumerate}
\hrule
\end{document}