Construct · 2 fields · 2 citations

Where does disjunction collide?

One name. Different field. Different construct. One map.

● jingle · one word, two constructs Nearest construct by meaning·not indexed
disjunction2 CONSTRUCTSLogical disjunctionPOST · P∨QDisjunction effectTVERSKY · SURE-THING

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1921Logical disjunction1992Disjunction effect
2026

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Logic

The 'or' connective over propositions

In logic, disjunction is the connective "or" joining two propositions: the inclusive disjunction P ∨ Q is true when at least one disjunct is true, while exclusive disjunction is true when exactly one is. Post's 1921 Introduction to a general theory of elementary propositions fixed its truth-functional definition within the truth-table treatment of the connectives. The referent is a truth-functional sentential operator defined by how the truth of the whole depends on its disjuncts.[1]

Unit
The truth value of "P or Q" as a function of its disjuncts
Recovery means
Not applicable
Measured by
Given by the truth table for inclusive (or exclusive) "or"

Decision psychology

People won't act under an unresolved 'or'

In the psychology of decision making, the disjunction effect is a violation of expected-utility reasoning in which people will take an action when they know which of two states holds, but not when the state is unknown, even though they would act in either state once told. Tversky and Shafir's 1992 The disjunction effect in choice under uncertainty demonstrated it, challenging Savage's sure-thing principle. The referent is a behavioural anomaly in choice under uncertainty, sharing only the word with the logical connective.[2]

Unit
The gap between willingness to act under a known state versus an unresolved disjunction of states
Recovery means
Not applicable
Measured by
Measured experimentally by comparing choice rates in known-outcome versus disjunctive (unknown-outcome) conditions

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Nearby collisions

tautology2 fields · 2 citationsjingle · one word, two constructssure-thing principle1 fields · 1 citationsanchor · a single constructaction3 fields · 6 citationsjingle · one word, three constructs

References

  1. Post, E. L. (1921). Introduction to a general theory of elementary propositions. American Journal of Mathematics, 43(3), 163–185. https://doi.org/10.2307/2370324
  2. Tversky, A., & Shafir, E. (1992). The disjunction effect in choice under uncertainty. Psychological Science, 3(5), 305–310. https://doi.org/10.1111/j.1467-9280.1992.tb00678.x

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