# Contents

## Idea

The notion of dendrex is the operadic analog of the notion of simplex.

## Definition

For $X$ a dendroidal set and $T$ a tree, a $T$-shaped dendrex of $X$ is a morphism

$\Omega[T] \to X \,,$

hence equivalently, by the Yoneda lemma, an element of the set $X(T)$.

Created on March 14, 2012 10:28:57 by Urs Schreiber (82.169.65.155)