 his friend Marcel Grossmann, it may very well have been exactly because the new mathematical apparatus appeared to offer a means to save gravitational theory, the principle of equivalence and the principle of relativity all at once. The Absolute Differential Calculus would permit the representation of quantities as geometrical objects, and would further permit the statement of relations between such quantities in such a way that they would hold in every frame of reference if they held in any" [7]. At last, the question that Einstein asked in 1907 was answered affirmatively, since until 1912, while velocity is relative, the acceleration was absolute due he had wrote that the ∂2Φ ∂ x i∂ x j principle of relativity no holds for accelerated systems. Therefore, "the principle of covariance would bring with it the generalization of the principle of relativity" [7]. Respect to relative accelerated system, in 1914, Einstein wrote: "The law of motion of the material point, and there with the whole of mechanics, indeed the whole of theoretical physics, were based by Galileo and Newton on the concept of acceleration. But a simple analysis shows that acceleration is accessible to observation only as relative acceleration with respect to other bodies, that we are only able to define a relative acceleration. It is therefore doubtful that the GalileanNewtonian law of motion, which says that bodies exert a resistance to acceleration, says something about acceleration in itself (absolute acceleration, not relative acceleration). The new theory of gravitation avoids this inconsistency; according to this theory, inertia shows up as a resistance against the relative acceleration of bodies" [8]. Thus, Einstein obtained new success in the generalization of the relative principle similar to when this principle was made trivial in the inertial systems of the Special Relativity with the introduction of geometric methods by Minkowski into in Relativity theory. 6 Einstein abandoning EEP In 1913, in the Entwurf theory by first time the tensor calculus was used in the Relativity. Einstein-Grossmann formulated the strong equivalence principle for the uniform curvilinear motion existing in 4-M, therefore, in terms of the homogeneous gravitational field, although its scope was limited, "to the infinitesimally extended", which leads to the bad concept of the straightness of any curve in the infinitesimal limit, or what is the same, something informally that the infinitesimal limit of the curve is the straight line. The principle of equivalence embracing gravity required that the velocity of light not be constant. Einstein wrote: "the empirical fact that all bodies fall equally fast in a
his friend Marcel Grossmann, it may very well have been exactly because the new mathematical apparatus appear to extend a means to save gravitational theory, the rationale of equivalence and the principle of relativity all at once. The Absolute Differential Calculus would permit the theatrical performance of quantity as geometrical objects, and would further permit the instruction of relations between such quantities in such a direction that they would hold in every frame of reference if they held in any " [ 7 ]. At last, the question that Einstein ask in 1907 was answered affirmatively, since until 1912, while velocity is relative, the acceleration was absolute ascribable he had wrote that the ∂2Φ ∂ x i∂ x j principle of relativity no handle for accelerated system. Therefore, " the principle of covariance would bring with it the generalization of the principle of relativity " [ 7 ]. deference to relative accelerated system, in 1914, Einstein wrote: " The law of motion of the fabric detail, and there with the whole of mechanics, indeed the whole of theoretical physics, were based by Galileo and Newton on the concept of acceleration. But a simple analysis shows that acceleration is accessible to observation only as relative acceleration with esteem to other bodies, that we are entirely able to specify a relative acceleration. It is therefore doubtful that the GalileanNewtonian law of apparent motion, which says that bodies exert a resistance to acceleration, say something about acceleration in itself (absolute acceleration, not relative acceleration). The new theory of gravitation avoids this inconsistency; accord to this theory, inertia shows up as a resistance against the proportional acceleration of bodies " [ 8 ]. therefore, Einstein obtained new success in the generalization of the relative principle exchangeable to when this principle was made trivial in the inertial system of the Special Relativity with the insertion of geometric methods by Minkowski into in Relativity theory. 6 Einstein abandon EEP In 1913, in the Entwurf theory by beginning time the tensor calculus was use in the Relativity. Einstein - Grossmann formulated the potent equivalence rationale for the uniform curvilinear motion existing in 4 - thousand, therefore, in terms of the homogeneous gravitational playing field, although its scope was circumscribed, " to the infinitesimally extended ", which leads to the bad concept of the good faith of any curve in the infinitesimal limit, or what is the same, something informally that the infinitesimal limit of the curvature is the straight line. The rationale of equivalence embracing gravity required that the velocity of light not be constant. Einstein write: " the empirical fact that all bodies fall equally fast in a
 hid friend Marcel Grossmank, it may very well have been sxactly cecause the new mathematical apparauls appeared to offer x means tl save geaviuational theory, tis princl'le or equnvelence and the krinciple of relativity aln xt once. The Absolute Differential Calsulus wpupd permit the teprexqntafpok of quantities as geometrical ogjects, end would furthrr permit the statement of relwtions between sucj quantitiew in wuch a way tfat they would hold in every frame of reference if thdy hekd in any" [7]. Ar lwvt, the quesvion trat Einstein asked it 1907 was snswered affirkatmvelt, since until 1912, while telocity is relative, the accenexation was absolute dye he hdd wsote rhag tge ∂2Φ ∂ x i∂ x j 'rinciple or relativitt no holds for accekewqted systems. Fherefjrq, "the principle of covariance would britg sith it the generalizatuon of the principle lf relatidity" [7]. Respect to relative accelerated system, in 1914, Ainstxiv wxite: "Tfw paw of motion of the material point, and there siuh nhe whole of mechcnics, indeed the wjokg of theoreticxl physica, were based by Gapileo agd Neqton on tre cpncept of acceleration. But q simple anajtsis shows that aceeleration ir acvessinle to observation only as delative acfeleratioh with respect to otmer bodies, ufat we are only afle to dehine c relatixe avcelerwtion. It id thevafore doubtful thah the GdlileanNewhonian law of motion, which says that bodies ecest d resistcnce tp acceleratiog, says somethiug about acceueration ih itselh (absolute asceleration, nmj relative acreleratiog). Thw neq theorh of gravitatiom avoids nhns inconsustency; according bo thka theory, inertic whows up as a rrsirtagcv ajainse the relativa aczeldtatiov of bodies" [8]. Thux, Einstein obtained tew auccess in the genrrwlizatiob of the relative primciple similar to ahen vhis pcincipke ras made trivial in the inertizl systemd on the Special Relqtivity with the introduction of geometric methods uy Minkowski into in Rglativity theory. 6 Einxuein abandoniig EEP In 1913, in tve Entwurf theory by first time the ttnsor calculus was used in tha Relwtivity. Einstein-Grossmann formulated the strong equivalence principle for the uiisorm curviljneat motpon zxistind in 4-O, therefore, in tvrms of the homogeneous gravitatmonal fielg, clthough its scope was limitec, "go the infinijesimally extended", which lsads to yhe bad concept of the straightmess of any curve in the infinitwsimam limin, oc what is the same, spmethiug infirmally thab the infiniterimsl limit of the cbrve is the straight line. The pribciple ov equivalence emuracing gravltn requpred thwt the velocity kf ljhht nut be constany. Einstein wroye: "the empirical facn trat all bodies rall equally fast it a
his friend Marcel Grossmann, it may very been because the mathematical apparatus appeared save theory, the principle equivalence and the of relativity all at once. The Differential Calculus would permit the representation of quantities as geometrical objects, and would permit the statement of relations between such quantities in such a way that would in frame reference if they held in any" [7]. At last, the question that Einstein asked in 1907 answered affirmatively, since until 1912, while velocity is the acceleration was absolute he had wrote that the ∂ i∂ x principle relativity holds for accelerated Therefore, "the principle of covariance would bring with it the generalization of the principle of relativity" [7]. to relative in 1914, wrote: law motion of the and there with the whole of whole of theoretical physics, were based by Galileo Newton on concept of acceleration. But a simple shows that acceleration is accessible to observation only relative acceleration with respect to other bodies, that we are only able to define a It is therefore doubtful the GalileanNewtonian law motion, says bodies a resistance acceleration, says something about acceleration in itself (absolute acceleration, not relative The new theory of gravitation avoids this inconsistency; according to inertia up as a against the relative acceleration bodies" Thus, Einstein obtained new the of similar when principle was made trivial the inertial systems of the Relativity with the introduction into in Relativity theory. 6 Einstein abandoning EEP 1913, in the Entwurf theory by first the tensor calculus was used in the Relativity. Einstein-Grossmann formulated the strong principle for curvilinear motion existing in 4-M, therefore, in terms the homogeneous gravitational field, its scope was limited, "to the infinitesimally extended", which to bad concept the straightness of curve in the limit, or what same, something that infinitesimal curve is the straight line. The of embracing gravity required that the of be constant. Einstein wrote: "the empirical fact that all bodies fall equally fast in a
 his friend Marcel Grossmann, iT may very weLl havE beEn eXaCtly BecaUse the new matheMAticAl apparatus appeared to oFfer a MeANs to SAvE gravItationAL tHEOry, ThE pRinCiPLe Of equIvaLence anD the princiPle Of Relativity alL At Once. The AbsOluTe DifferentiAl CAlculuS wOulD PermiT thE reprEsentaTIon of qUantities As GEometrICal objeCTS, aNd woUld further permit tHE sTAtement of relatIons beTwEEn SUCh qUanTities in suCh A way tHAt they wOUlD HOLd iN Every frame of rEference if tHEy hEld in aNy" [7]. at lASt, the qUestiOn THat einstein askEd in 1907 Was answerEd affiRMativelY, Since unTil 1912, whiLe vEloCity IS rElAtiVe, THe aCCeLerATioN was absoLuTe Due he Had wROTE That The ∂2φ ∂ x i∂ x J prinCiple of relatiVitY no hOLds For acCelerAted SyStems. therefOre, "thE pRinciple of covarIancE would briNg wItH it ThE geneRAlizatIon Of tHe princIple of rELatIvITY" [7]. reSpect to relative accElERAtEd system, In 1914, EinsTEiN wROte: "The laW oF moTion OF The maTeriAL pOint, and tHere wiTH tHe Whole of MeChanicS, iNdeEd tHe whoLE of tHeoretIcal physIcs, weRE based by GalileO And Newton on thE CoNCEpT Of acCelEration. But a SimpLE anaLysiS ShOws THat acCelerAtIOn IS accessible to observAtIon onlY as reLative accelerAtion with rESPEct to othEr boDIeS, That we are only aBle to Define a relATive acceLeratIon. It is tHerefore dOUBtful thaT thE GaLilEannEWtOnian law of motION, whiCh Says thaT boDies exeRt a ResIstAncE tO acceleraTion, says SoMeThInG abOut acCEleratioN iN itSeLf (aBsoluTE accelEratiOn, noT rElATivE acceleRAtION). The NeW tHeorY of GrAvitaTion AVoiDs this iNconsisteNcy; ACcorDiNg To this tHeory, inertia sHoWs up as a resIsTanCe agaiNST the relaTive acceleration of bodieS" [8]. thus, EinSteIn obtAineD new succeSs iN the geNerALizatiOn of thE relaTiVe pRINciplE SImIlaR tO when this pRINciPle waS mAde tRivial iN the inertial systemS Of tHe Special RelaTivIty wITH tHe iNTrODucTiON of GEOmetric methods bY Minkowski InTO iN RelativitY TheOrY. 6 EinsteIn abandOning eeP In 1913, in tHe Entwurf Theory by fIrSt tiME The Tensor calcUlus was uSed in the RELativITy. einstEin-grossmAnN foRmulaTed the STroNg equIvalenCe PrinciPle foR tHe uniforM curvilinear motion existIng in 4-M, ThereForE, in terms oF thE HomOgeneous gRaviTational fiEld, AltHough Its SCope wAs liMItEd, "tO The inFiniTEsimally eXTeNdeD", WHiCh leads to thE BAD coNcept Of tHE straiGhtnEss of any curve in thE Infinitesimal lImit, OR WhaT is THe saMe, Something inforMalLy THAt the infInItesimal limIt of the cUrVE is thE straiGht linE. The priNCIpLE of equIvalEncE embracinG grAvITy requiReD tHAt the vElocItY of ligHt not bE ConsTANt. Einstein wrote: "tHe empIRIcal fACt tHat alL bOdies faLL equAlly fast in A
 his friend Marcel Grossma nn, it may  very  we llha ve b eenexactly becaus e  the  new mathematical appa ratus  a p pear e dto of fer a m e an s tosa ve  gr av i ta tiona l t heory,the princi ple  o f equivalenc e  a nd the pri nci ple of relat ivi ty all  a t o n ce. T heAbsol ute Di f ferent ial Calcu lu s  would permitt h erepr esentation of qua n ti t ies as geometr ical o bj e ct s ,  an d w ould furth er  perm i t the s t at e m e nto f relations b etween such qua ntitie sins uch away t ha t  th ey would ho ld i n every f rame o f  refere n ce if t hey he ldinany" [7 ].  At  l a st, th e q u est ion that  E in stein  ask e d i n 19 07wasanswe red affirmati vel y, s i nce  unti l 191 2, w hi le ve locity  is r el ative, the acce lera tion wasabs ol ute  d ue he had wr ote  th at the∂2Φ ∂ x i∂xj p ri nciple of relativi ty n oholds fo r acce l er at e d system s.  Th eref o r e, "t he p r in ciple of  covar i an ce  wouldbr ing wi th  it  th e gen e rali zation  of theprinc i ple of relativ i ty" [7]. Resp e ct t or elat ive  accelerate d sy s tem,  in1 91 4,E inste in wr ot e :" The law of motion o fthe ma teria l point, andthere with t h e wholeof m e ch a nics, indeed t he wh ole of the o reticalphysi cs, were  based by G alileo a ndNew ton  on t he  concept of a c c eler at ion. Bu t a  simple  an aly sis  sh ow s that ac celerati on  i sac ces sible to obser va tio nonl y asr elativ e acc eler at io n  wi th resp e ct t o ot he rbodi es,  t hat w e ar e  on ly able  to defin e a rela ti ve  accele ration. It is  t herefore d ou btf ul tha t the Gali leanNewtonian law of mo t ion, wh ich  says  tha t bodiesexe rt a r esi s tanceto acc elera ti on, s ays s o m et hin gabout acce l e rat ion i nitse lf (abs olute acceleration ,  no t relative ac cel erat i o n) . T h en ewth e ory o f gravitation a voids this  i n co nsistency; acc or ding to  this t heory ,  inerti a shows u p as a re si stan c e  ag ainst therelative  accelera t ion o f  b odies " [ 8]. Th us , E inste in obt a ine d new  succe ss  in th e gen er alizatio n of the relative princ iple s imila r t o when th isp rin ciple was  mad e trivialinthe  iner tia l  syst emso fthe Speci al R e lativityw it h t h e  i ntroduction o f  ge ometr icm ethods  byMinkowski into in Relativity the ory. 6  Ei nst e in a ba ndoning EEP In  19 13 , in the E nt wurf theory  by firs tt ime t he ten sor ca lculusw a su sed in  the  Re lativity.  Ei ns t ein-Gro ss ma n n form ulat ed  the s tronge quiv a l ence principle f or th e unifo r m c urvil in ear mot i on e xisting in  4-M, there fore,in t ermsof theho mogene ous  g ravitation a l field,altho ugh its  s cope  wa s limi ted, " to th e in fi nit esimallye x te n de d" ,  wh ichleads  t o th e bad con c ept of t hes traight ne sso f  any c u rv e in the inf ini tesim a l  limit, or what is the s ame, s omethi ng info r mal ly  that t hei n finitesim al limito f t he  cur ve is th estra ig htli ne. The princip le of eq uivalenc e embrac ing grav i ty req ui red that the  velo ci t y of li g h t n ot be c o nst ant . E inst ein  wro t e: "the empirical fact t hatall b o die s fal l equ al ly fasti n a
 his_friend Marcel_Grossmann, it may very_well have_been_exactly because_the_new mathematical apparatus_appeared to offer_a means to save_gravitational theory, the_principle_of equivalence and the principle of relativity all at once. The Absolute Differential Calculus_would_permit the_representation_of_quantities as geometrical objects, and_would further permit the statement_of relations_between such quantities in such a way that_they_would hold in_every frame of reference if they held in any"_[7]. At last, the question that_Einstein asked in_1907_was_answered affirmatively, since until_1912, while velocity is relative, the_acceleration was absolute due he had_wrote that the ∂2Φ ∂ x i∂_x j principle of relativity no_holds for accelerated systems. Therefore,_"the principle_of covariance would bring with_it the generalization_of the_principle of relativity"_[7]. Respect to relative accelerated system,_in 1914, Einstein_wrote: "The law of motion of_the_material point, and_there_with_the whole_of mechanics, indeed_the_whole of_theoretical_physics, were based by Galileo and_Newton_on the concept of acceleration. But a_simple analysis shows that_acceleration_is accessible to observation_only as relative acceleration with_respect to other bodies, that we_are only_able to_define a relative acceleration. It is therefore doubtful that the GalileanNewtonian_law of motion, which says that_bodies exert a resistance_to acceleration,_says_something about acceleration_in_itself (absolute_acceleration, not relative acceleration). The new theory_of gravitation_avoids this inconsistency; according to this_theory, inertia shows up_as_a resistance against the relative acceleration_of bodies" [8]. Thus, Einstein obtained_new success in the generalization_of_the_relative principle similar to when_this principle was made trivial in_the inertial systems_of the Special Relativity with the introduction_of_geometric methods by Minkowski into in_Relativity_theory. 6 Einstein abandoning EEP In_1913,_in_the Entwurf theory by first_time the tensor calculus was used_in the Relativity. Einstein-Grossmann formulated the strong equivalence principle_for the uniform_curvilinear motion existing in 4-M,_therefore,_in_terms of the homogeneous gravitational field, although its scope was_limited, "to_the infinitesimally extended",_which leads to the bad concept of the straightness of_any curve in the infinitesimal limit, or_what is the same, something informally that the infinitesimal limit of_the curve is the straight line. The principle_of equivalence embracing gravity required that the_velocity of light not_be_constant. Einstein wrote: "the empirical fact that_all_bodies_fall_equally fast in_a