Abstract

I. EPISTEMOLOGICAL SUGGESTIONS From an epistemological view, classifying a statement as 'vague' means to judge the statement in question to be a mixture from partial knowledge and partial ignorance. Accordingly it seems desirable to describe the boundary between knowledge and ignorance hidden in the vague statement. Ludwig discusses vagueness in physics, especially vagueness in measuring statements. The example he uses is 'measurement of Euclidean distance', i.e. the meaning of statements which are often written as "d(x,y) = α ± ε", where vagueness is expressed by "± ε" indicating the so-called "error of measurement". Ludwig maintains that physicists have come to refrain from supposing that physical objects have exact properties which cannot be measured exactly (but only within the indicated 'error of measurement'). … But what is the alternative? …