 <h5>U</h5>
umbilical point, 249
uncertainty
absolute, 792
fuzzy, 360
relative, 792
ungula, cylinder, 155
union
fuzzy sets, 365, 366
sets, 292
units
SI system, 1012
units, physical, 1012
universal quantifier, 289
universal substitution, 438
urn model, 755