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popper-logic-scientific-discovery

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168<br />

some structural components of a theory of experience<br />

that does not vary with the ordinal number of the element). And it<br />

follows, finally, that ‘absolute freedom’ will entail insensitivity to all* 3<br />

combinations of these two types of selection.<br />

61 THE LAW OF GREAT NUMBERS<br />

(BERNOULLI’S THEOREM)<br />

Bernoulli’s theorem, or the (first1 ) ‘law of great numbers’ can be<br />

derived from the third binomial formula by purely arithmetical reasoning,<br />

under the assumption that we can take n to the limit, n →∞. It can<br />

therefore be asserted only of infinite sequences α; for it is only in these<br />

that the n-segments of αn-sequences can increase in length indefinitely.<br />

And it can be asserted only of such sequences α as are ‘absolutely free’,<br />

for it is only under the assumption of n-freedom for every n that we can<br />

take n to the limit, n →∞.<br />

Bernoulli’s theorem provides the solution of a problem which is<br />

closely akin to the problem which (following von Mises) I have called<br />

‘Bernoulli’s problem’, viz. the problem of the value of F(m). As<br />

αn<br />

indicated in section 56, an n-segment may be said to have the property<br />

‘m’ when it contains precisely m ones; the relative frequency of ones<br />

within this (finite) segment is then, of course, m/n. We may now<br />

define: An n-segment of α has the property ‘∆p’ if and only if the<br />

relative frequency of its ones deviates by less than δ from the value<br />

αF(1) = p, i.e. the probability of ones in the sequence α; here, δ is any<br />

small fraction, chosen as near to zero as we like (but different from<br />

zero). We can express this condition by saying: an n segment has the<br />

property ‘∆p’ if and only if | m<br />

− p |

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