# Advice To A Young Scientist by P. B. Medawar

By P. B. Medawar

To these attracted to a lifestyles in technological know-how, Sir Peter Medawar, Nobel laureate, deflates the myths of invincibility, superiority and genius; as a substitute, he demonstrates it's normal feel and an inquiring brain which are necessary to the scientist's calling.

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VK/~ = 0 number. e. be direct of ~/~ , where prime with by field No, vK sum which the . described: the infinite. 12 Let K group. be (Subfield Structure a Henselian Let us p-valued M be The a p-adic H isomorphism lattice LiK of its of F. 8 by all F there coarse value , and d o e s of K . H c r c radical v not too the is finite and on the to natural [L:K] subextensions depend two = of IH}. MIK choice of statements: factor of group determined by its group H = vL/vK MIK of the field extension LIK isomorphism vL/vK on of the attaching LIK finite to F LIK a natural the valuation is by If lattice MIK using is u n i q u e l y is t h e v a l u e subextension the above.

In c £ K the by instance any we resulting foregoing other may element take the ~c same = properties particular p-adic are not it closure M,M' of p-adic us put the n 6 = n L , as may same K proved = replace the element coarse value. For element. e. [¢L':%K] , and dL, M' of (as v a l u e d M~ t 'n = that closures a K-isomorphism this with follows K-isomorphic of with K(t') [L':K] In we field L' has construction K = dK . Now let a p-adic closure , and claim fields). M' then let us now both t, t' we For if identify are M be of L' that there M a .

That For admits only valuation on coincides the K-embedding the valuations. embedding on L and This Henselian valuation L the fields. e. true property prolongation with ~ : L ~ the . Hence L' it i < is should since K of implies to K L induced ~ is compatible be an assumed . 10 in the hypotheses special (i) and case (ii) arguments, to t h i s be of special First where field LIK the above EIK finite that every L ~ L' of G a l o i s We have general case where Henselian. This Since L More precisely identify Kh We now have (as v a l u e d LIK of i n f i n i t e being (i) m a y is H e n s e l i a n there with finite its algebraic image / K h I K finite inherited in admits From this n !