Skip to Main Content

Home Categories

Quiz Builder

Free quiz building from a large question library, with custom questions and first-party online play.

Pro

AI quiz building, image questions, private quizzes, and advanced export workflows for serious creators.

API

Authenticated API access for builders creating their own quiz apps, workflows, and integrations.

Color scheme

© QuestionStock

Library snapshot4,089 questions30 categories

All systems operational

Categories Features Quiz Builder Pro API

About Pricing Quizzes Support Contact

Status API docs Terms Privacy

Representative image for question: Which modal axiom corresponds semantically to serial frames (every world accesses some world)?

Categories
Logic

Which modal axiom corresponds semantically to serial frames (every world accesses some world)?

Medium

Create a free account to see more questions and build your own quiz.

Which modal axiom corresponds semantically to serial frames (every world accesses some world)?

Options:

D: □p → ◇p
T: □p → p
4: □p → □□p
5: ◇p → □◇p

Correct answer: D: □p → ◇p

Explanation: Axiom D (□p → ◇p) enforces seriality, the frame condition ∀w ∃v R(w,v). This semantic requirement guarantees every world has at least one R-successor in the model.

Created 2026-03-10T18:51:36.804Z. Updated 2026-03-10T18:51:36.804Z.

Which modal axiom corresponds semantically to serial fram... | QuestionStock