Construct · 2 fields · 2 citations

Where does accessibility collide?

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

● jingle · one word, two carriers Nearest construct by meaning·not indexed
accessibility2 CONSTRUCTSAccessibility (modal)HUGHES · MODAL LOGICAccessibilityHANSEN · TRANSPORT GEOGRAPHY

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1959Accessibility1996Accessibility (modal)
2026

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Modal logic

The relation between possible worlds that defines necessity

In modal logic, accessibility is the relation R between possible worlds: a statement is necessary at a world w when it is true at every world accessible from w. This meaning comes from Hughes (1996/2012) in A new introduction to modal logic. Here accessibility is not the transport-geography measure of how easily activities can be reached from a location.[1]

Unit
an ordered pair (w,v)
Recovery means
Kripke frame semantics
Measured by
properties of R (reflexive, transitive...)

Transport geography

The ease of reaching activities and opportunities from a location

In transport geography, accessibility is the ease of reaching activities and opportunities from a location, given the transport network. This meaning comes from Hansen (1959) in Journal of the American Institute of Planners. Here accessibility is not the relation between possible worlds that modal logic uses to define necessity.[2]

Unit
opportunities reachable
Recovery means
gravity/cumulative-opportunity models
Measured by
accessibility index

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Nearby collisions

gravity-based accessibility1 fields · 1 citationsanchor · a standalone constructmodality3 fields · 5 citationsjingle · one word, three constructsrelation4 fields · 4 citationsjingle · one word, four constructs

References

  1. Hughes, G. E., & Cresswell, M. J. (2012). A new introduction to modal logic. Routledge. (Original work published 1996) https://doi.org/10.4324/9780203028100
  2. Hansen, W. G. (1959). How Accessibility Shapes Land Use. Journal of the American Institute of Planners, 25(2), 73-76. https://doi.org/10.1080/01944365908978307

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