PICCOLBAffi LITOECAE INAUDI 545 Scienza Titoolroi giTnahlPee r obolePfmhy ss ics OxforUdn iversPirteys s © r978A .J.e gLget © 19G9i1ul Eiion aueddii tosr.p.e a .T,o rino TraduzidoiGn iea nluigi Mainardi 88-06-12524-9 ISBN A.LJE.G GET lP ROBLEMI DELLFAI SICA Dalcloas molaolgpliaear ticelle subathoem.i c Piccola Biblioteca Einaudi Indice p.VI I Prefazione x Notaall 'edizione italiana Ip robledmeilfi lsai ca 3 I. L'allesstciemnenitcoo 45 II.D i cheè f caotlstamaa a teria? m.L 'uinvresost:r utetdeu vroal uzione 99 139 IV.F isiscusa c aulmaa na 180 v.S chelneet'lralir madio 215 VI.U nos guarald fuot uro 225 Bibliografia Preafzione Quesltiob vruoo els seurne' introaddua zlicoudnneeii maggiporroib lcehmieif s iiscitir ovaongoga id ovearf ­ frnotaSroen.po a rtdiatplor esuppcohisellt e ot taobrbei a uncae rftmaai liacroiqntu àe galsip edtetltile ao artioam ica delmlaat ecrhiseao noor meanit raaf atpria rdteel clual tu­ rac ontempomraap neeirarl ,e sntoond ebbnae cessaria­ mentpeo sseudnearp er eparatzeiconnLieac dad.o ovce­ corsrcae ndneemrlee r idtiao r gom«enpsteicc iifih»o,c er­ catpoe qru anptoos sidib rielned earultio sufficienti. Sarebabses uprrdeot enidnue nr'eo pdeiqr uae sptreo ­ porzidoidn air uen 'iadnecahs eo laop proastsiidvmeal la varieem toàl tepdlici iccòih tdeàe fin«iafismio»c .a Mi so­ nop ercviiòs to comsitomr aeltgtroaa,di og,n ornaorne soltarnitstov« ioa ilp pclai»t,mi at ututnaas erdiiae ffa sci­ nanptrio blreemliaa tlilv'io rganeial zlazs aozcoiigooinlae. Anzhi,od ovurtaos segnaalrlm'ii ncomppelrestienzoz a nell'admebliflstiaio cc ao nsidceormadeti as cippulrian­a mentaec cadesmtiecram;si entattqoiur aill,afii s iactao mi­ cam,o lecoflniaarnecn,ou clesaornseot, a ctoim plet­amen tes acrifmiecnatatrliet-, rr iicolar'sdtor oefl iabs iiiocsfai ­ ca- vengocniot atdii s sfoulgago.Ri itasspuensrto om mi capnie cla pitionliozi icla almem ifnioqn u pie rcohros o, dunquper efecrointcoe ntsruaq rumait t«rrfoo nt»i ere della ricecrhcreai taetrntagugoai olnee vorlampepnrtee­ sentadtei'lvaler gomfesinitcdoae: l plaer ticcoeslmloel,o ­ giaf,i sdieclaml aat ecroinad enesq auteas t«idoifn oni­ do»;le f rnotiemrise pi,a slsasi e mpilciafzicoonrserp,io n- VIII A.JL.E GGETT denatlil 'infiniptiacmceoinlntofe,i nitgarmaennedt­ee, stremamceonmtpel eeas sssoo lutnaembeounsltoNe.u tro salcdoan nvziiocnhelei ' nseridmiae lnttbrore a ncchoem e la geoofil safsi iiccaa nupcolcaeoga grieu ngesrupelib ab­e noq uiatlacthigevi onà o ns ieas empliifnqi uceasqttuoea t­ traor ee. Oggetdtiqo u esltiob ro sionntoe rgrldoiio g gagtii,v i nonl er ispcohselta efi sihcaag ifàor ni.Mt ios onfota to dunqoubeb ldiigd oa ruen vai sigoennee rdaelllee's «i sten­ te»s oltannetlmoli as uirnca u cii vòa laer aggiuunng ere osservdaatc ouprioi tose pra zsiuapirr eo blcehmeis tcain ­ no dinInnaq nuzeiss.tt ae ssap uosrtof trizcaan,dd oiim li­ lustarg arraenl diini ep er inbcaipsiii lnasrniiet lil 'acquisi­ ziodneedi a tsip erimennetlvalaleri ai ree e,e vihtoda it o approfognldii raeps rpaettditecili l 'inedmapgiirnIielc a. lettcohree dedsoicduemrein stuallsrats riu tdteultrleaao ­ ricao nsoloi dsamuteiat osdpie rimeinnut saocl oir ren­ tep uòc onsulist aagregge il a ir tiecloelninc ealtBliia b lio­ grafia. Pefrni iruen,pa a roalimai ecio llengechlai s,aqo u alcu­ nod ie ssi caspoittta'soqscuece hsvitoool utmtenoo:nè i n­ dirizalz oart!Noo o nd ubicthote r overqauneanl oàm oti­ vo ddiis accionvr edroip;ti dàui,u nvao lta hor edsoiv­uto stearletl ean tazdiiao vnaen zsaucr eer atffee ramzioqnuie l­ lafi lzdair isetrevcen icchhee b seons ea rebibnedrios pen­ sabsiclrii vpeenurdn ora i viqsutaialc iafmtaad ,a' ltpraar te rendereibtlbe esritono d igearini obni« laded etatili a vo­ ri»In.p articsoolnaaorc eu,t amceonntseva opleceh el a bredvies amnienlal 'uclatpiimtdooe llol 'appl-idcia bilità cumia ncapnroo cveer -tdeeflor maliqsumaton o-mecca­ niciont otaos istceommip lbeasnsail uinz ztaei mratdo i diiffcoalntcàph eeg rl eis petratnidt,aop oteesrs ere giudi­ catfau orviema angtaear did iriotlttugrriaaogT suat.ct ioò chpeo ssoè cd hinere els leedo ip porthuodn aeta ol l'argo­ mentboe na ltsrpoe sseoder set en;sc ihoineeddeurneqiu e ai potenczriiatlpiirc iimc,ah c eo ldm'ii ndignparzeino-ne