 In his 1915, §25, Meinong introduces in more detail the notion of incompletely determined objects, i.e., objects that are undetermined with respect to at least one property. Pure things like the triangle as such are incomplete objects. The triangle as such has three angles (a constitutive property), it has three sides (a consecutive property, one that is somehow included in the object’s constitutive properties), but it is neither scalene nor non-scalene, neither green nor non-green etc. In such cases denying that a is F does not imply affirming that a is not F, because the denial that a is F may also be correct when a is not determined with respect to F. Incomplete objects infringe the law of excluded middle (and impossible objects infringe the law of noncontradiction) with respect to internal negation only (predicate negation: “~”) and not with respect to external negation (sentence negation: “¬”). Meinong would have acknowledged the validity of