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                    | Schouten J.A., van der Kulk W. — Pfaffs Problem and Its Generalizations | 
                  
                
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                          of        149  
  of        175f  
  of        279  
  under C-transformations      280  
  of        285  
       6 49  
       20  
       18 20 21  
       11  
       21  
       11  
       21  
       23  
       22  
       175  
 -transformation      210 ff  
 -transformation, characteristic functions of infinitesimal      243 f 272  
 -transformation, field preserving      212  
 -transformation, generating function of      221  
 -transformation, rank of      216  
 -transformation, Rule I      215  
 -transformation, Rule II      219  
 -transformation      229 ff  
 -transformation, and        347  
 -transformation, characteristic functions of infinitesimal      244 f 271  
 -transformation, field preserving      230  
 -transformation, generating function of      232  
 -transformation, Rule I      231  
 -transformation, Rule II      232  
 -transformation      224 ff  
 -transformation, and        332  
 -transformation, characteristic function of infinitesimal      245 271  
 -transformation, field preserving      224  
 -transformation, generating function of      227  
 -transformation, Rule I      225  
 -transformation, Rule II      228  
       185  
       88  
       72  
 ,   in        5 6  
 ,   in  , in        49  
       1 2  
 , centred      1  
 , local      4 7  
       2  
       350 357  
 ,   of        278 283  
 ,   of  , under C-transformations      279  
       207  
       351 357  
       185  
  (characters of Goursat system)      377 383  
       419  
  of        281  
  of        283  
 ,   of        282  
 ,   of        281 f  
 -rank of        274  
       61 ff  
 , connecting quantities      62  
 , reduction with respect to      63  
 , section with      63  
  in        33 ff  
  in  , connecting quantities      39 40  
  in  , mill form      39  
  in  , parametric form      40  
  in  , reduction with respect to      52  
  in  , section With      52  
       29 ff  
 -forming systems of vector fields      128 129  
  (Kronecker symbol)      5  
 ,        55  
 ,        19  
       29  
       29  
       207 273  
         283  
         278  
         281  
         283  
   ,        282  
   -rank      274  
   ,        285  
  and  -transformations      347 275 332  
  canonical form of equations      332  
  class K      279  
  dis-homogenization      273 286  
  field dimension      208 274  
  field region      208 274  
  homogenization      273 286  
  index l      279  
  integrability      286 ff  
  integral-  of class < K      320 ff  
  integral-       286 296  
  null form      273  
  parametric form      273  
  Poisson bivector      278  
  reduced form of equations      298  
  rotation class 2p      279  
  similarity class k      279  
 ,        208  
 -field      275  
 -field,        433 436 452 456  
 -field, adjoint  -field of      420  
 -field, and Goursat systems      446 ff  
 -field, cases A, B, and C      425ff  
 -field, field dimension      418  
 -field, general integral-       455  
 -field, induced  -field      431  
 -field, integral-       418  
 -field, null form      457 ff  
 -field, parametric form      419  
 -field, preferred      423  
 -field, quasi-linear      418 445  
 -field, stationary        436 f  
 -field, theorem of integrability of      296 423 437  
 -field, theorem of uniqueness      I 453 II 454 III 464  
 -fieid integrability of      296  
       103  
       199  
  (species of Ooursat system)      388  
  of  -field      433 436 452 456  
 ,   of        285  
  (s-number of Goursat system)      385  
Abbreviated system      115 122  
Absolute integral invariant of        74  
Absolute integral invariant of        76  
Absolute invariant field with respect to        44 96 98  
Absolute invariant field with respect to        74 97 98 144 145  
Absolute invariant field with respect to        132 184  
Addition      8  
Adjoint system      84  
Adjoint' -field      420  
Admitted infinitesimal point transformation      136 ff  
Affine, geometry      32  
Affine, group      1  
Affine, space      1  
Affinor, density      19  
Affinor, inverse of      8  
Affinor, matrix of      7  
Affinor, pseudo-      3  
Affinor, unity      7  
Alexander, J.W.      10  
Allowable coordinates      1  
Alternated multiplication      13  
Alternation      9  
Analytic field      47  
Analytic function      30  
Analyticity in a region      33  
Analytisches Plachenstuck      516  
 | Anholonomic system      51  
Arithmetic, manifold      29  
Arithmetic, point      29  
Auto isomorphic field      148 164  
Auxiliary system      120  
Basis      3 7  
Basis, theorem      I 37 II 38  
Basis, transformation      38 275  
Behnke, H.      516  
Bibliography      534  
Bivector      13  
Bivector, decomposition into blades      15  
blades      15  
Bracket expression, of Lagrange      246 ff  
Bracket expression, of Poisson      246 ff 253  
Burstin, C.      349 355  
c,        149 175  
C-transformation      199 ff  
C-transformation, double homogeneous      232  
C-transformation, field preserving      212  
C-transformation, infinitesimal      241 ff  
Canonical form      147  
Canonical form, of        160 ff  
Canonical form, of   with given initial conditions      170 ff  
Canonical form, of        332  
Canonical form, of function group      260 269  
Canonical form, of homogeneous equation      96  
Canonical form, of homogeneous system      113  
Canonical representation      147  
Cartan, E.      v vi 73 136 148 151 153 160 172 173 199 349 350 355 358 377 378 385 387 388 410 416 417 461 475 502 529  
Cartan, theorem of Cartan — Kaehler      358 ff  
Cartan, theorem of integrability of      362  
Cartan, theorem system      356  
Cases A, B, C Grynaeus and the  -field      425 ff  
Cases A, B, C, D Grynaeus      187 ff  
Cases I and II, of      150 ff  
Cases I and II, of        176  
Cases I, II, and III of  -field      425 ff 428  
Cauchy, generalized integration method of      313  
Cauehy, A.      90  
cell      32  
Centred,        1  
Chain, ordinary      441 443  
Chain, regular      351 358  
Chain, test for regular chains      397 ff  
Characteristic function, of infinitesimal  -transformation      243 f 272  
Characteristic function, of infinitesimal  -transformation      244 f 271  
Characteristic function, of infinitesimal  -transformation      245 271  
Characteristic number of representation      147  
Characteristics, of        89  
Characteristics, of        152 161  
Characteristics, of Goursat system      378  
Characters      377  
Class, of        149  
Class, of        175  
Class, of        278  
Class, of covariant q-vector fields      321 ff  
Class, of function group      263   
Class, of sets of geometric objects      146 ff  
Clebsch, A.      vi  
Closed Goursat system      355  
Closed Goursat system, ring of      412  
Comitant, differential      63 ff  
Complete homogeneous systems      86  
Complete homogeneous systems, existence theorem for      108  
Complete integrability of  -field      423  
Complete non-homogeneous systems      110  
Complete non-homogeneous systems, existence theorem for      111  
Complete Riquier arrangement      507  
Complete solutions      307  
components      4  
Components intermediate      8  
Components of arithmetic point      29  
Compounds-vector      14  
Cone        435  
Cone        429  
Conjugate set of functions      157 ff  
Conjugate systems      173  
Connecting quantity, of   in        20 21  
Connecting quantity, of        62  
Connecting quantity, of   in        39 40  
Contact-point      47  
Contain      2  
Contraction      8  
Coordinate system      30 31  
Coordinate- 's      2  
Coordinates, allowable      1  
Coordinates, transformation of      31  
Courant, R.      50  
Cutting off of BSC-system      473  
D      64  
Darboux, G.      vi  
De Donder, Th.      73 129  
Dead indices      5  
Decomposition, of p-vector      15  
Decomposition, of regular systems      53  
densities      19 ff  
Dependent functions      33  
Derivative, Lie      72  
Derivative, natural      48 64  
Derivative, paramotrical      507  
Derivative, principal      507  
Derived system      86 103  
Determinant, functional      30  
Determinant, main sub-      38  
Differential comitant      63 ff  
Dimension of      6 6  
Dimension of, support of      4  
Dimension, field      47  
Dimension, of domain      5 6  
Dimension, of null form      35  
Dimension, of parametric form      40  
Diminished class, point of      149 186  
Direction      2 48  
Dis-homogenization of        273 286  
Div, divergence      64  
Divisor of p-vector      14  
Domain      4 6 10 11  
Dragging along      70 ff  
Eisonhart, L.P.      199 210 224 229 241 253 255 262 271  
Elimination, theorem of      42  
Eloment manifold  ,        208  
Engol, F.      vi 73 82 88 91 92 94 98 102 104 107 109 113 125 126 128 136 199 210 224 229 233 241 246 251 253 255 262 271 273 306 316 318 319  
Enveloped,        84 86  
Enveloped, normal system      84 199  
Enveloped, Rule I      205  
Enveloped, Rule II      206  
Enveloping,        82 86  
Enveloping, normal system      82 85  
Equiscalar hypersurface      48  
Equivalent systems of equations      34  
Existence theorem, of Cauchy — Kowalewski      90  
Existence theorem, of complete homogeneous system      108  
Existence theorem, of complete non-homogeneous system      111  
Existence theorem, of implicit functions      41  
Existence theorem, of one homogeneous equation      91  
Existence theorem, of one non-homogeneous equation      95  
Existence theorem, of Riquier      508  
Extended point transformation      217  
Extension of incomplete system      102 ff  
Extraordinary integral-  of NRSG-system      503  
Extraordinary points of NRSG-system      503  
Faber, K.      vi 73 82 88 91 92 94 98 102 104 107 109 113 115 126 128 136 199 210 224 229 233 241 246 251 253 256 262 271 273 306 316 318 319  
Field      47  
Field dimension      47  
Field dimension, of        208 274  
Field dimension, of  -field      418  
Field region      47  
Field region, of        208 274  
Field,        296  
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