# Homotopy Type Theory suplattice > history (Rev #1, changes)

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# Contents

## Definition

A $\mathcal{U}$-large suplattice is a lattice $(L, \leq, \bot, \vee, \top, \wedge)$ with

• a family of functions

$T:\mathcal{U} \vdash \Vee_{n:\mathcal{T}_\mathcal{U}(T)} (-)(n): (\mathcal{T}_\mathcal{U}(T) \to L) \to L$
• a family of dependent terms

$T:\mathcal{U}, n:\mathcal{T}_\mathcal{U}(T), s:\mathcal{T}_\mathcal{U}(T) \to L \vdash i(n, s):s(n) \leq \Vee_{n:\mathcal{T}_\mathcal{U}(T)} s(n)$
• a family of dependent terms

$T:\mathcal{U}, x:L, s:\mathcal{T}_\mathcal{U}(T) \to L \vdash i(s, x):\left(\prod_{n:\mathcal{T}_\mathcal{U}(T)}(s(n) \leq x)\right) \to \left(\Vee_{n:\mathcal{T}_\mathcal{U}(T)} s(n) \leq x\right)$

representing that all $\mathcal{U}$-small joins exist in the lattice.