Measure, Vantage, Branchcone, and Counterfactuals

Summary

Formal definitions of four key QBU concepts. Measure: Objective probability (quantum amplitude squared) of events across branches. Vantage: Reference event-point (“now”) anchoring timeline calculations—contains initial conditions. Branchcone: Set of all timelines branching from a Vantage through specific duration. Counterfactuals: Alternate Vantages with different past; counterfactual true iff Measure at alternate Vantage ~1 for consequent. Provides rigorous mathematical framework for QBU reasoning, removing ambiguity from probability, causality, and “what if” questions. Example: “If aspirin, no headache” = comparing Measure at two Vantages. Foundation for subsequent decision theory work.

Tags

• quantum
• epistemology
• probability
• qbu-framework
• counterfactuals
• bayesianism

Cross-References

• Related: A Rigorous Definition of Causality

Notes

• Formal/technical definitions
• Core QBU vocabulary established
• Removes vagueness from counterfactual reasoning
• Referenced heavily in later posts