People often need to choose between alternatives with known probabilities (risk) and alternatives with unknown probabilities (ambiguity). Such decisions are characterized by attitudes towards ambiguity, which are distinct from risk attitudes. Most studies of ambiguity attitudes have focused on...

Consider an agent with fuzzy preferences. This agent, however, has to make exact choices when faced with different feasible sets of alternatives. What rule does he follow in making such choices? This paper provides an axiomatic characterization of a class of binary choice rules called the...

1: Binary Relations: Definitions, Representations, Basic Properties -- 1.1. Binary relations -- 1.2. Graph representation of binary relations -- 1.3. Coding the binary relations -- 1.4. Matrix representation of binary relations -- 1.5. Basic properties of binary relations -- 1.6. Particular...