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Denjoy–Young–Saks theorem

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87:
is a real valued function defined on an interval, then with the possible exception of a set of measure 0 on the interval, the Dini derivatives of
259: 238: 333: 48: 289: 56: 44: 255: 234: 32: 313: 281: 273: 226: 248: 285: 277: 244: 222: 28: 298: 327: 20: 317: 36: 265: 269: 230: 60: 75:, chapter IV, theorem 4.4) give historical accounts of the theorem. 221:, Lecture Notes in Mathematics, vol. 659, Berlin, New York: 91:
satisfy one of the following four conditions at each point:
264:, Monografie Matematyczne, vol. 7 (2nd ed.), 8: 16:Mathematical theorem about Dini derivatives 72: 67:) extended it to arbitrary functions. 40: 52: 7: 68: 64: 27:gives some possibilities for the 14: 219:Differentiation of real functions 299:"On the Derivates of a Function" 297:Young, Grace Chisholm (1917), 1: 71:, Chapter IX, section 4) and 217:Bruckner, Andrew M. (1978), 272:: G.E. Stechert & Co., 350: 43:) proved the theorem for 25:Denjoy–Young–Saks theorem 318:10.1112/plms/s2-15.1.360 31:of a function that hold 306:Proc. London Math. Soc. 98:has a finite derivative 261:Theory of the Integral 334:Theorems in analysis 57:measurable functions 45:continuous functions 231:10.1007/BFb0069821 240:978-3-540-08910-0 55:) extended it to 33:almost everywhere 341: 320: 303: 293: 288:, archived from 251: 29:Dini derivatives 349: 348: 344: 343: 342: 340: 339: 338: 324: 323: 301: 296: 256:Saks, Stanisław 254: 241: 223:Springer-Verlag 216: 213: 202: 192: 166: 149: 130: 113: 81: 17: 12: 11: 5: 347: 345: 337: 336: 326: 325: 322: 321: 312:(1): 360–384, 294: 252: 239: 212: 209: 208: 207: 200: 190: 171: 164: 147: 135: 128: 111: 99: 80: 77: 73:Bruckner (1978 15: 13: 10: 9: 6: 4: 3: 2: 346: 335: 332: 331: 329: 319: 315: 311: 307: 300: 295: 292:on 2006-12-12 291: 287: 283: 279: 275: 271: 267: 263: 262: 257: 253: 250: 246: 242: 236: 232: 228: 224: 220: 215: 214: 210: 205: 199: 195: 189: 185: 182: 178: 175: 172: 169: 163: 159: 156: 152: 146: 142: 139: 136: 133: 127: 123: 120: 116: 110: 106: 103: 100: 97: 94: 93: 92: 90: 86: 78: 76: 74: 70: 66: 62: 58: 54: 50: 46: 42: 38: 34: 30: 26: 22: 309: 305: 290:the original 260: 218: 203: 197: 193: 187: 183: 180: 176: 173: 167: 161: 157: 154: 150: 144: 140: 137: 131: 125: 121: 118: 114: 108: 104: 101: 95: 88: 84: 82: 24: 18: 153:is finite, 117:is finite, 21:mathematics 286:0017.30004 278:63.0183.05 211:References 69:Saks (1937 79:Statement 328:Category 266:Warszawa 258:(1937), 249:0507448 63: ( 51: ( 39: ( 284:  276:  247:  237:  59:, and 37:Denjoy 23:, the 302:(PDF) 206:= –∞. 186:= ∞, 170:= –∞. 160:= ∞, 134:= –∞. 124:= ∞, 49:Young 270:Lwów 235:ISBN 65:1924 61:Saks 53:1917 41:1915 314:doi 282:Zbl 274:JFM 227:doi 83:If 19:In 330:: 310:15 308:, 304:, 280:, 245:MR 243:, 233:, 225:, 196:= 179:= 143:= 107:= 47:, 35:. 316:: 268:- 229:: 204:f 201:+ 198:D 194:f 191:– 188:D 184:f 181:D 177:f 174:D 168:f 165:– 162:D 158:f 155:D 151:f 148:+ 145:D 141:f 138:D 132:f 129:+ 126:D 122:f 119:D 115:f 112:– 109:D 105:f 102:D 96:f 89:f 85:f

Index

mathematics
Dini derivatives
almost everywhere
Denjoy
1915
continuous functions
Young
1917
measurable functions
Saks
1924
Saks (1937
Bruckner (1978
Springer-Verlag
doi
10.1007/BFb0069821
ISBN
978-3-540-08910-0
MR
0507448
Saks, Stanisław
Theory of the Integral
Warszawa
Lwów
JFM
63.0183.05
Zbl
0017.30004
the original
"On the Derivates of a Function"

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