a class | of

OF
abbr. chem. scient.	Oxygen Free
abbr. el. scient.	Optical Fiber
abbr. IT	Output File; Overflow Flag
abbr. mil.	Objective Force; Opposing Force; Optional Form
abbr. progr. IT	Open File
abbr. sport.	Outfield; Outfielder

gravitational instantons generalizing Witten | s

s.
abbr. libr.	sign

| bubble of nothing

bubble of nothing
space	...a class of gravitational instantons generalizing Witten's bubble of nothing