 as, for example, the Mercury s orbit and in the Newtonian limit, they delivered the Newton s law of gravity, both requirements were satisfied. Of other hand, today we know that there is not general theory of relativity but if the very powerful Grossman-Einstein equations [26] which were obtained from the absolute differential calculus of the 19th century and of the variational calculus, so hard to understand as of to work. Also, so distant that in the future they result as easy as the algebra whose origin goes back to the Babylonian mathematics of the 19th-16th centuries BC. More exactly, the Grossman-Einstein-Hilbert equations because it must include also the Hilbert contribution obtained from the variational calculus and called Einstein-Hilbert action that yields the Einstein field equations through the principle of least action. As compensation to the sacrifice that personal circumstances and interests imposed on him, in pragmatic form, Einstein got the most out of the general covariance in the terms of general relativity principle and point-coincidence argument. Something similar, that to in spite of his deafness Beethoven continued composing. And as in the Fifth Symphony, the very human fury of the creation is capable of overcoming the force of fate. Then, Einstein wrote: "The general laws of nature are to be expressed by equations which hold good for all systems of coordinates, that is, are covariant with respect to any substitutions whatever (generally covariant). It is clear that a physical theory which satisfies this postulate will also be suitable for the general postulate of relativity. For the sum of all substitutions in any case includes those which correspond to all relative motions of three-dimensional systems of coordinates. That this requirement of general covariance, which takes away from space and time the last remnant of physical objectivity, is a natural one, will be seen from the following reflexion. All our spacetime verifications invariably amount to a determination of spacetime coincidences. If, for example, events consisted merely in the motion of material points, then ultimately nothing would be observable but the meetings of two or more of these points. Moreover, the results of our measuring are nothing but verifications of such meetings of the material points of our measuring instruments with other material points, coincidences between the hands of a clock and points on the clock dial, and observed point-events happening at the same place at the same time. The introduction of a system of reference serves no other purpose than to facilitate the description of the totality of such coincidences. We allot to the universe four spacetime
as, for example, the Mercury s orbit and in the Newtonian limit, they delivered the Newton s jurisprudence of graveness, both requirements were satisfied. Of early hand, today we sleep together that there is not general hypothesis of relativity but if the very herculean Grossman - Einstein equations [ 26 ] which were obtain from the absolute differential calculus of the 19th hundred and of the variational calculus, so hard to understand as of to shape. Also, so distant that in the future they result as easily as the algebra whose origin goes back to the Babylonian mathematics of the 19th-16th centuries BC. More precisely, the Grossman - Einstein - Hilbert equations because it must include also the Hilbert contribution obtain from the variational calculus and called Einstein - Hilbert action that yields the Einstein field equation through the principle of least action. As compensation to the sacrifice that personal circumstances and interests imposed on him, in pragmatic form, Einstein got the most out of the general covariance in the terms of general relativity principle and point - coincidence controversy. Something similar, that to in spite of his deafness Beethoven stay composition. And as in the Fifth Symphony, the very human ferocity of the creation is capable of overwhelm the force of fate. Then, Einstein wrote: " The general law of nature are to be expressed by equations which hold good for all systems of coordinates, that is, are covariant with obedience to any substitutions whatever (generally covariant). It is clear that a physical theory which satisfies this postulate will besides be desirable for the cosmopolitan postulate of relativity. For the sum of all substitutions in any case includes those which correspond to all relative motions of three - dimensional systems of coordinate. That this requirement of cosmopolitan covariance, which takes away from space and time the last end of physical objectivity, is a natural one, will be watch from the following reflexion. All our spacetime verifications invariably total to a determination of spacetime concurrence. If, for example, events consist merely in the motion of fabric points, then ultimately nothing would be observable but the meetings of two or more of these distributor point. Moreover, the results of our measuring are nothing but verifications of such meetings of the corporeal points of our measuring instrument with other material points, coincidences between the hands of a clock and points on the clock dial, and observe point - events happening at the same place at the same clock time. The initiation of a arrangement of reference serves no other purpose than to facilitate the description of the totality of such coincidence. We allot to the universe four spacetime
 as, for example, the Mercury s orbit and in the Nextonian limit, tfey delivered the Newton s lew od gracity, both requirements were satpsfied. Of othtr hand, today we know thab thedc is uov general theori of relativhty but if the vdrv powerful Grossman-Einstein equationf [26] whicn aere obtained srom ehe zbsolute differential calculus of fhe 19th bentury and of thr variational calculus, so jard to understand as lf to work. Qlso, wo distant tfat in the future they result as easy as the algebra dhose origin gogs bwwk to the Bebylonpan mathematigx of tve 19th-16th centuries BC. Korx exqctly, the Grossman-Einvtein-Hilbert equatyons becagsz it must include alsi rhe Hhlbest cubtrkbuuioi ogtainef fcom the varjational caoculus and called Eonfnrin-Hilbert adtion ehwt yields the Einstein field equations uhroufh the principle of leawt action. As compensajion to thq sacrifice that personal circumstances and interasts mmoostd on hkn, ln pragmatic form, Einstein got the most out os tne general covarlance in the terms ov bgneral relativkty prnhcjple and point-coinfidence argunent. Someuhing similar, that to in spite od his deafnefw Beethoven continbed composiny. And ss in the Fifth Symphony, the verg human furj of the dfeation is capabue pf overcoming the force of fwte. Then, Xinstzin wrotd: "Thg generwl laws of natuva are to be expresded bi equadions whicj hold good for all systems of rpordinates, tnad iv, are corarianb with respect eo any substitotions whctever (generally covarient). It is clqar that a phfdical theory which swtisdies this purtulate will akso be suptcble for rhe general postulete ur relativity. Fox uhw sum of all sibsgitttponx yt any case itcluaes yhose which corrcspund yo all relative motimns kf three-dimensionak fystems if coordynates. That tnis requirement of genecal cotarianve, rhich takes away from space ans time thf lwst remnant jf pmysisal objectnvity, is a natural one, will be seen from the following refoexion. All our spacgtike verificavions ynvariablf amount to a determunation of spacetlme coincidences. If, fod exam[le, egents consisted merely in the motion of material points, then ultimately nithing would be obaervsble tuc tke meetyngs uf two or more og these points. Moreover, the resnlts of ous ieasuring are nothing but vetiwications of ruch meetings of the matsrial poonts of our measuring instrumenys with other material ppints, councidsnces betwxen the hands of a ckock aud poibts on rhe glock dial, and obxevved point-fvenus hcppening at the same place at the same rile. The introductmon of a sysbeo of teferencg serves no other purllse tfan to faciliyate the descroption of the totaliny jf such coincievnces. We alloj to the universe fonr spacetime
as, for example, the Mercury s orbit the limit, they the Newton s were Of other hand, we know that is not general theory of relativity if the very powerful Grossman-Einstein equations [26] which were obtained from the absolute calculus of the 19th century and of the variational calculus, so hard to as to Also, distant that in the future they result as easy as the algebra whose origin goes back the Babylonian mathematics of the 19th-16th centuries BC. exactly, the Grossman-Einstein-Hilbert equations it must include also the contribution from the calculus called action that yields Einstein field equations through the principle of least action. As compensation to the sacrifice that personal circumstances interests imposed in pragmatic Einstein the out of the in the terms of general relativity argument. Something similar, that to in spite of deafness Beethoven composing. And as in the Fifth the very human fury of the creation is of overcoming the force of fate. Then, Einstein wrote: "The general laws of nature are expressed by equations which good for all of that are with respect any substitutions whatever (generally covariant). It is clear that a physical which satisfies this postulate will also be suitable for the of For the sum all substitutions in any includes which correspond to all of systems this of covariance, which takes away space and time the last of physical objectivity, is seen from the following reflexion. All our spacetime invariably amount to a determination of spacetime If, for example, events consisted merely in the motion of material points, ultimately nothing observable but the meetings of two or more these points. Moreover, the of our measuring are nothing but verifications of such of material points our measuring instruments other material points, between the hands clock and on clock point-events happening at the same place the time. The introduction of a of no other purpose than to facilitate the description of the totality of such coincidences. We the universe four spacetime
 as, for example, the Mercury s orBit and in thE NewtOniAn lImIt, thEy deLivered the NewtON s laW of gravity, both requiremEnts wErE SatiSFiEd. Of oTher hanD, ToDAY we KnOw ThaT tHErE is noT geNeral thEory of relaTivItY but if the verY PoWerful GrosSmaN-Einstein equAtiOns [26] whiCh WerE ObtaiNed From tHe absoLUte difFerential CaLCulus oF The 19th ceNTUrY and Of the variational cALcULus, so hard to undErstanD aS Of TO WorK. AlSo, so distanT tHat in THe futurE ThEY REsuLT as easy as the aLgebra whose ORigIn goes BaCk tO The BabYloniAn MAthEmatics of thE 19th-16tH centurieS BC. MorE Exactly, THe GrossMan-EinSteIn-HIlbeRT eQuAtiOnS BecAUsE it MUst Include aLsO tHe HilBert CONTRibuTioN obtAined From the variatIonAl caLCulUs and CalleD EinStEin-HiLbert aCtion ThAt yields the EinsTein Field equaTioNs ThrOuGh the PRincipLe oF leAst actiOn. As comPEnsAtION To The sacrifice that peRsONAl CircumstAnces aND iNtERests impOsEd oN him, IN PragmAtic FOrM, EinsteiN got thE MoSt Out of thE gEneral CoVarIanCe in tHE terMs of geNeral relAtiviTY principle and pOInt-coincidencE ArGUMeNT. SomEthIng similar, tHat tO In spIte oF HiS deAFness beethOvEN cONtinued composing. And As In the FIfth SYmphony, the verY human fury OF THe creatiOn is CApABle of overcominG the fOrce of fate. tHen, EinstEin wrOte: "The geNeral laws OF Nature arE to Be eXprEssED By Equations whicH HOld gOoD for all SysTems of cOorDinAteS, thAt Is, are covaRiant witH rEsPeCt To aNy subSTitutionS wHatEvEr (gEneraLLy covaRiant). it is ClEaR ThaT a physiCAl THEory WhIcH satIsfIeS this PostULatE will alSo be suitaBle FOr thE gEnEral posTulate of relatIvIty. For the sUm Of aLl subsTITutions iN any case includes those whICh correSpoNd to aLl reLative motIonS of thrEe-dIMensioNal sysTems oF cOorDINates. tHAt ThiS rEquirement OF GenEral cOvAriaNce, whicH takes away from spacE And Time the last reMnaNt of PHYsIcaL ObJEctIvITy, iS A Natural one, will bE seen from tHe FOlLowing reflEXioN. ALl our spAcetime VerifICations InvariablY amount to A dEterMINatIon of spaceTime coinCidences. IF, For exAMpLe, eveNts ConsisTeD meRely iN the moTIon Of matErial pOiNts, theN ultiMaTely nothIng would be observable but The meeTings Of tWo or more oF thESe pOints. MoreOver, The results Of oUr mEasurIng ARe notHing BUt VerIFicatIons OF such meetINgS of THE mAterial poinTS OF ouR measUriNG instrUmenTs with other materiAL points, coincidEnceS BEtwEen THe haNdS of a clock and poIntS oN THe clock dIaL, and observeD point-evEnTS happEning aT the saMe place AT ThE Same tiMe. ThE inTroductioN of A sYStem of rEfErENce serVes nO oTher puRpose tHAn to FACilitate the descrIptioN OF the tOTalIty of SuCh coincIDencEs. We allot tO the universE four sPaceTime
 as, for example, the Merc ury s orbi t and  in  th eNewt onia n limit, theyd eliv ered the Newton s lawof gr av i ty,b ot h req uiremen t sw e resa ti sfi ed .  O f oth erhand, t oday we kn owth at there isn ot  general t heo ry of relati vit y butif  th e  very  po werfu l Gros s man-Ei nstein eq ua t ions [ 2 6] whic h we re o btained from thea bs o lute different ial ca lc u lu s ofthe  19th cent ur y and of thev ar i a t ion a l calculus, s o hard to u n der standas  of to wor k. Al so ,  so  distant th at i n the fut ure th e y resul t  as eas y as t healg ebra wh os e o ri g ing oe s b a ckto the B ab yl onian  mat h e m a tics  of  the  19th -16th centuri esBC.M ore  exac tly,theGr ossma n-Eins tein- Hi lbert equations  bec ause it m ust  i ncl ud e als o  the H ilb ert  contri butiono bta in e d fr om the variational  c a l cu lus andcalled Ei ns t ein-Hilb er t a ctio n thatyiel d sthe Eins tein f i el dequatio ns  throu gh  th e p rinci p le o f leas t action . Asc ompensation to the sacrifice th a t  p e rson alcircumstanc es a n d in tere s ts  im p osedon hi m, in pragmatic form, Ein st ein go t the  most out ofthe genera l c ovarianc e in th e  terms of gene ral r elativityp rinciple  andpoint-co incidence a rgument.  So met hin g s i m il ar, that to i n spit eof hisdea fness B eet hov encon ti nued comp osing. A nd  a sin  th e Fif t h Sympho ny , t he  ve ry hu m an fur y ofthecr ea t ion  is cap a bl e of o ve rc omin g t he  forc e of fat e. Then , Einstei n w r ote:  " Th e gener al laws of na tu re are tobe  ex presse d by equat ions which hold good fo r  all sy ste ms of  coo rdinates,  th at is,  ar e  covar iant w ith r es pec t to an y su bst it utions wha t e ver  (gen er ally  covari ant). It is cleart hat  a physical t heo ry w h i ch  sa t is f ies  t h isp o stulate will al so be suit ab l efor the ge n era lpostula te of r elati v ity. Fo r the sum  of all s ub stit u t ion s in any c ase incl udes thos e  whic h  c orres pon d to a ll  re lativ e moti o nsof th ree-di me nsiona l sys te ms of co ordinates. That this re quirem ent o f g eneral co var i anc e, whichtake s away fro m s pac e and  ti m e the  las t  r emn a nt of  phy s ical obje c ti vit y ,  i s a natural o n e,willbes een fr om t he following refl e xion. All ourspac e t ime  ve r ific at ions invariabl y a mo u n t to a d et erminationof space ti m e coi nciden ces. I f, fore x am p le, ev ents  co nsisted m ere ly in themo ti o n of m ater ia l poin ts, th e n ul t i mately nothing w ouldb e  obse r vab le bu tthe mee t ings  of two or  more of th ese po ints . Mor eover,th e resu lts  o f our meas u ring arenothi ng butve rifi cat ions o f su c h  meet ings  o f t he materi a l  p o in ts ofourmeasu ri ng i nstrument s  with ot her materia lpoi n t s, coi n ci d e nces betwe enthe h a n ds of a cl o ck a n dp oints  on th e cloc k dial, and  o bserved  po i n t-eventshappening atth e sa me place  a t th esam etime. The intro ductionof a sys t e m of r efe r ence serves  n o other purp ose t ha n  to fac i l ita te thed esc rip tio n of  th e to t ality of such coincidenc es.We al l otto th e uni ve rse four spac etime
 as,_for example,_the Mercury s orbit_and in_the_Newtonian limit,_they_delivered the Newton_s law of_gravity, both requirements were_satisfied. Of other_hand,_today we know that there is not general theory of relativity but if the_very_powerful Grossman-Einstein_equations_[26]_which were obtained from the_absolute differential calculus of the_19th century_and of the variational calculus, so hard to_understand_as of to_work. Also, so distant that in the future they_result as easy as the algebra_whose origin goes_back_to_the Babylonian mathematics of_the 19th-16th centuries BC. More exactly,_the Grossman-Einstein-Hilbert equations because it must_include also the Hilbert contribution obtained from_the variational calculus and called Einstein-Hilbert_action that yields the Einstein_field equations_through the principle of least_action. As compensation_to the_sacrifice that personal_circumstances and interests imposed on him,_in pragmatic form,_Einstein got the most out of_the_general covariance in_the_terms_of general_relativity principle and_point-coincidence_argument. Something_similar,_that to in spite of his_deafness_Beethoven continued composing. And as in the_Fifth Symphony, the very_human_fury of the creation_is capable of overcoming the_force of fate. Then, Einstein wrote:_"The general_laws of_nature are to be expressed by equations which hold good for_all systems of coordinates, that is,_are covariant with respect_to any_substitutions_whatever (generally covariant)._It_is clear_that a physical theory which satisfies this_postulate will_also be suitable for the general_postulate of relativity. For_the_sum of all substitutions in any_case includes those which correspond to_all relative motions of three-dimensional_systems_of_coordinates. That this requirement of_general covariance, which takes away from_space and time_the last remnant of physical objectivity, is_a_natural one, will be seen from_the_following reflexion. All our spacetime verifications_invariably_amount_to a determination of spacetime_coincidences. If, for example, events consisted_merely in the motion of material points, then ultimately_nothing would be_observable but the meetings of_two_or_more of these points. Moreover, the results of our measuring_are nothing_but verifications of_such meetings of the material points of our measuring instruments_with other material points, coincidences between the_hands of a clock and points on the clock dial, and_observed point-events happening at the same place at_the same time. The introduction of a_system of reference serves_no_other purpose than to facilitate the description_of_the_totality_of such coincidences._We allot to_the universe four_spacetime