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Lambda Calculator Change Log

2/2021 - 7/2022 (update to version 2.6.0)

Authors: Raef Khan, Kaustubh Ghoshal, Pinhan Zhao

  1. Implemented Commutativity and Associativity
  • Made the following operations commutative and associative: And, Or, Iff, Equality, Fusion, Multiplication, Set Union, Set Intersection.
  1. Added Bracket Highlighting
  • When brackets match, they are highlighted in green. If there are not enough brackets, the mismatched ones will highlight red.
  1. Other bug fixes and features
  • Fixed bugs #25 and #28
  • Added input symbol for Set Union
  • Parser now throws an error when a word is defined multiple times.
  • Added brackets around product types to make them more explicit. Product types always bind more tightly than implicit comma.
  • Fixed spacing issue with comma seperator when a composite type has a product type as one of the subtypes.

9/2020 - 1/2021 (update to version 2.5.0)

Authors: Anna Alsop, Raef Khan and Nigel Flower

  1. Renamed "Lambda Abstraction" to "Predicate Abstraction"
  • This was done to facilitate clarity with the textbook.
  1. Fixed bug #23
  • Implemented matching with variable types and constant types in student exercises.
  1. Removed Save Dialogue on Reload
  • In the teacher edition, when reloading a file, the GUI no longer asks the user to save unsaved work.

7/2020 - 8/2020 (update to version 2.4.0)

Authors: Anna Alsop and Raef Khan

  1. Function composition
  • New function composition rule added (issue #31)
  1. Polymorphism revamp
  • Polymorphism functionality enhanced for complex variable types
  1. Other bug fixes and new features
  • Variable types now display as Greek letters
  • Reload function made compatible with unsuccessful loads (issue #27)
  • Dialog window prompting user to save work before subsequent reload (issue #30)
  • After reloading, the same exercise is selected.

5/2019 - 8/2019 (update to version 2.3.0)

Authors: Anna Alsop and Raef Khan

  1. Launch4j exe packager
  • Update launch4j
  • Bundle java with exe file
  1. Other bug fixes and new features
  • All instances of primes are now printed as apostrophes
  • Addressed issue #2, #21
  • Fixed issue #14 (type parser bug)
  • Capital letters can now be used for types
  • Brought visual display of meaning bracket expressions in line with Coppock & Champollion textbook draft
  1. Updates to wiki:
  • New navigation menu
  • Special Symbols and Exercise File Format pages newly created
  • Polymorphism example exercise file added to wiki
  • Related Projects section added to LambdaCalculator.com site
  • Added override mode documentation to Exercise File Format page
  • Exercise files may contain special symbols; documented in Exercise File Format page

Previous updates

2019-08-26: Version 2.3.0


  • fix type parser bug where types could not have two adjacent open brackets '<' (issue # 14)
  • new error message generated when a type specification has an extra close bracket '>'
  • capital letters can be used for types
  • updated launch4j
  • bundle java with exe file

2018-09-02: Version 2.2.0


  • fix loading of student exercises saved with traces
  • add support applying functions with product types
  • add support for nested product types
  • open window goes to Downloads directory at beginning of session
  • open window goes to previous open directory otherwise
  • updated "About" window in Mac

2015-12-07: Version 2.1.0


  • replace [[ ]] with << >>

  • choose variables based on indices, eliminating need for (explicitly represented) assignment fns

  • functions wrapped in [ ] instead of ( )

  • bracketing conventions now match Heim and Kratzer

  • add support for *-ed constants

  • add individual-level fusion, via +, and part-of, via <: (with Ctrl-: as interactive keyboard shortcut)

  • single-letter identifiers off by default (since bound variables are now hardcoded to have multiple characters, e.g. v2)

  • eliminate precedence conventions between and/or and if/iff

  • infix grouping with [ ] instead of ( )

  • apostrophe rather than ? indicates type var (e.g., <'at,t> rather than <?at,t>)

  • treat cat nodes above dummy terms as dummies (fixes bug)

  • reduce terms in all positions of an arglist (fixes bugs)

  • match type vars with functional types to support, e.g., generalized junction (fixes bugs)

  • display previous lambda conversion exercises when focused

2013-04-01: Version 2.0.0-beta


  • Codesigned Mac application to bypass Gatekeeper security checks
  • Support for Intensional Function Application
  • Traces and indices with arbitrary type specifications
  • Export trees to LaTeX
  • Support for polymorphic types on functions and arguments

2008-03-29: Version 1.0.12


  • Fixed alphabetical variants of { x | ... } notation.
  • Fixed loading saved exercise files that use the new expression types.

2008-03-21: Version 1.0.11


  • Treat { x | ... } as a binder.
  • In the scratch pad window, when there's a syntax error in the problem statement, move the cursor to the location of the problem.
  • Allow the empty set symbol and raw integer numbers to be used in predicate logic expressions.

2008-03-20: Version 1.0.10


  1. Added to our predicate logic:
    • Set notations { a, b, c } and { ... | ... }.
    • Set intersection, union, subset, proper subset, superset, proper
    • superset, and cardinality.
    • Integer multiplication. This is for the 'most' generalized quantifier.
    • Integer greater than, less than, those + or equal.
  2. Added a new example file and updated the documentation for generalized quantifiers.

Version 1.0.09


  • Allow omega and sigma symbols to be included in logical expressions.
  • Improved the naming conventions display for multiple letter identifiers.
  • In exercise files, parse multiple letter type conventions.
  • Update docs and example file.

2008-01-30: Version 1.0.08


  • Corrected a problem reading exercise files saved in UTF8 with an initial byte order marker.
  • Corrected a problem saving exercise files with meaning brackets.

2007-12-12: Version 1.0.07


  • Corrected a problem saving exercise files with identifier conventions without explicit description text.
  • Fix typo-type mistakes in example2.txt

Previous releases

gh-pages branch: https://github.com/nyusemantics/LambdaCalculatorPublic/releases