Definition nelstructonempty2 {X : UU} (nx : neg X) : nelstruct 0 X := weqcomp weqstn0toempty (invweq (weqtoempty nx)).
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.MoreFoundations.DecidablePropositions. Require Import UniMath.MoreFoundations.NegativePropositions. Require Import UniMath.MoreFoundations.Subtypes.