Introduction .................................................... 1
Notation and Terminology ........................................ 5
Chapter 1. Affine Group Schemes over a Field of Characteristic
Zero ................................................. 7
1.1 Groups ..................................................... 7
1.2 Representations ........................................... 14
1.3 Spaces of homomorphisms ................................... 25
Chapter 2. Universal and Minimal Reductive Homomorphisms ....... 33
2.1 Reductive homomorphisms ................................... 33
2.2 Universal reductive homomorphisms ......................... 42
2.3 Minimal reductive homomorphisms ........................... 50
Chapter 3. Groups with Action of a Proreductive Group .......... 59
3.1 Simply connected groups ................................... 59
3.2 Groups with action of a group ............................. 65
3.3 Equivariant homomorphisms ................................. 71
Chapter 4. Families of Minimal Reductive Homomorphisms ......... 83
4.1 Stratifications and constructible subsets ................. 83
4.2 Reductive group schemes ................................... 89
4.3 Universal families ....................................... 101
Bibliography .................................................. 117
Index ......................................................... 119
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