+-- {: .num_defn} ###### Definition (interval object) Let $C$ be a closed monoidal (V-enriched for some $V$) homotopical category, let $*$ denote the tensor unit of $C$. Then the cospan category (same objects and cospans as morphisms) is $V$-enriched, too. An *interval object* is defined to be a cospan $*\stackrel{a}{\rightarrow}I\stackrel{b}{\leftarrow}*$. The pushout $I^{\coprod_2}$ of this diagram satisfies ${}_*[ I,I^{\coprod_2}]_*\simeq$ is contractible (see [[nLab:co-span]] for this notation). =-- +-- {: .num_defn} ###### Definition (directed object) Let $C$ be a closed monoidal (V-enriched for some $V$) homotopical category, let $*$ denote the tensor unit of $C$, let $I$ denote the interval object of $C$, let $X$ be a pointed object of $C$. A *direction for $X$* is defined to be a subobject $dX$ of $[I,X]$ satisfying (1) every map $I\to *\to X$ factoring over the point is a (generalized) element of $d X$. (2) $d X$ is closed under pushout. A global (or just generalized) element of $d X$ is called *directed path in $X$* A *directed object* is defined to be a pair ${}_d X:=(X,dX)$ consisting of an object $X$ of $C$ and a direction $dX$ for $X$. A *morphism of directed objects* $f:(X,dX)\to (Y,dy)$ is defined to be a pair $(f,df)$ making $$\array{ X& \stackrel{f}{\to}& Y \\ \downarrow^d&&\downarrow^d \\ dX& \stackrel{df}{\to}& d Y }$$ =-- +-- {: .num_remark} ###### Remark Let $C$ be $V$-enriched, closed monoidal homotopical category, let $I$ denote the tensor unit of $C$. =-- +-- {: .num_defn} ###### Definition A *directed-path-space objects* is defined. =--