Marco Benini submitted the
prftree
package.
Version number: 2014/11/30 License type: gpl
Summary description: A new package to typeset proofs in natural deduction and similar
Announcement text: ----------------------------------------------------------------------
A new package to typeset proofs in natural deduction and similar
----------------------------------------------------------------------
This package is located at http://mirror.ctan.org/macros/latex/contrib/prftree/
More information is at http://www.ctan.org/pkg/prftree
We are supported by the TeX Users Group http://www.tug.org . Please join a users group; see http://www.tug.org/usergroups.html .
------------------------------------------------------------------------
Thanks for the upload.
For the CTAN Team Petra Rübe-Pugliese