Knowledge

Birational invariant

Source 📝

76:; every Riemann surface comes from an algebraic curve, well defined up to birational equivalence and two birational equivalent curves give the same surface. Therefore, the Riemann surface, or more simply its 53: 172: 45: 25: 49: 133: 17: 88: 143: 155: 151: 124:
Reichstein, Z.; Youssin, B. (2002), "A birational invariant for algebraic group actions",
103: 77: 73: 69: 166: 92: 84: 41: 111: 147: 106:
projective complex surface are birational invariants. The Hodge number
65: 138: 68:
himself: in his thesis, he shows that one can define a
64:
The first example is given by the grounding work of
114:a point to a curve on the surface can augment it. 8: 137: 52:. In other words, it depends only on the 83:A more complicated example is given by 24:is a property that is preserved under 7: 14: 40:is a quantity or object that is 126:Pacific Journal of Mathematics 1: 110:is not, since the process of 80:is a birational invariant. 189: 148:10.2140/pjm.2002.204.223 46:birational equivalence 26:birational equivalence 87:: in the case of an 38:birational invariant 22:birational invariant 173:Birational geometry 50:algebraic varieties 18:algebraic geometry 89:algebraic surface 32:Formal definition 180: 158: 141: 56:of the variety. 188: 187: 183: 182: 181: 179: 178: 177: 163: 162: 123: 120: 78:Geometric genus 74:algebraic curve 70:Riemann surface 62: 34: 12: 11: 5: 186: 184: 176: 175: 165: 164: 161: 160: 132:(1): 223–246, 119: 116: 61: 58: 54:function field 33: 30: 13: 10: 9: 6: 4: 3: 2: 185: 174: 171: 170: 168: 157: 153: 149: 145: 140: 135: 131: 127: 122: 121: 117: 115: 113: 109: 105: 101: 97: 94: 93:Hodge numbers 90: 86: 81: 79: 75: 71: 67: 59: 57: 55: 51: 47: 43: 39: 31: 29: 27: 23: 19: 139:math/0007181 129: 125: 107: 104:non-singular 99: 95: 85:Hodge theory 82: 63: 42:well-defined 37: 35: 21: 15: 118:References 112:blowing up 48:class of 167:Category 72:to each 60:Examples 156:1905199 66:Riemann 154:  91:, the 134:arXiv 102:of a 44:on a 98:and 20:, a 144:doi 130:204 16:In 169:: 152:MR 150:, 142:, 128:, 36:A 28:. 159:. 146:: 136:: 108:h 100:h 96:h

Index

algebraic geometry
birational equivalence
well-defined
birational equivalence
algebraic varieties
function field
Riemann
Riemann surface
algebraic curve
Geometric genus
Hodge theory
algebraic surface
Hodge numbers
non-singular
blowing up
arXiv
math/0007181
doi
10.2140/pjm.2002.204.223
MR
1905199
Category
Birational geometry

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.