popper-logic-scientific-discovery

Truth-function 113n, 284, 315
Truth-value 275
Two-slit experiment appendix v,
297&n–300, 477–82
Uncertainty see Hypothesis
Uncertainty principle see
Heisenberg’s formula
Uniformity of nature, principle of
70n, 250–1, 381–2, 459&n, 460,
see also Metaphysical faith in
regularities
Uniqueness 24
Universal statements 4, 5, 15, 19, 23,
41, 49n, 70n, 202, 256, 386–91;
existential 185; as prohibitions
48, 96; strict or non-existence
41t–2, 46n, 82–3&n, 84, 186, 447,
452, 460; strict versus numerical
section 13, 40–2, see also Laws;
Names, universal; Zero
probability
Universality, accidental and
necessary 447–8, 453–60; levels
of 25, 55, section 18, 55–6, 64,
section 36, 105–7t&nt, 108, 268,
270, 273, 276, 277, 278, 446, 460
Universals, problems of 45, 47,
53–4, 76, 463, see also Names,
universal
Use or usage of words xviii, 43–4,
45, 47, 64&n, 276
Validity, Bolzano’s concept of 103n
Value of judgements concerning
subject index 513
science, necessary 16, 29, 34, see
also Decisions
Verdict 91–3
Verification of an existential
statement, possible 10, 48–9&n,
70; of a basic statement,
impossible 71, 75, 444&n; or
confirmation in the sense of
weak verification 10, 15n, 16, 28,
32, 59, 249n, 256&n, 259–60,
267n, 272, 278, 314, 317; of
probability statements,
impossible 183&n, 184, 185&n,
188&n; of universal statements,
impossible in one way and too
easy in another 18, 19, 20, 42, 49,
57n, 71, 82–3n, 137n, 159, 199,
228, section 79, 249–52, 255,
262–4, 317, 383–4, 442–6, see
also Instantiation; Zero
probability
Vienna circle 29n, 37n, 264n,
312–13, 313
Wave-packet 216–17t, 219, 230,
304; reduction of 231&nt–2,
467n, 471
Zero probability, of a universal
statement 18n, 255, appendix vii,
374–86, 396–7, 398, 404, 423,
432
Zero probability of the second
argument 334–6, 340, 366n, 404,
405