# CTAN update: prooftrees

This version fixes two bugs: line no shift now works correctly and a stray edge has been eliminated which was otherwise erroneously drawn in certain cases.

This package is located at http://mirror.ctan.org/graphics/pgf/contrib/prooftrees More information is at http://www.ctan.org/pkg/prooftrees We are supported by the TeX user groups. Please join a users group; see http://www.tug.org/usergroups.html .

Thanks for the upload. For the CTAN Team Manfred Lotz

## prooftrees – Forest-based proof trees (symbolic logic)

The package supports drawing proof trees of the kind often used in introductory logic classes, especially those aimed at students without strong mathemtical backgrounds. Hodges (1991) is one example of a text which uses this system. When teaching such a system it is especially useful to annotate the tree with line numbers, justifications and explanations of branch closures.

prooftrees provides a single environment, `prooftree`,
and a variety of tools for annotating, customising and highlighting
such trees. A cross-referencing system is provided for trees
which cite line numbers in justifications for proof lines
or branch closures.

prooftrees is based on forest and, hence, TikZ. The package requires version 2.0.2 of Forest for expected results and will not work with version 1.

Package | prooftrees |

Version | 0.6 |

Maintainer | Clea F. Rees |