+ <span class="emph beta">2014 June 18.</span>
+ Preservation of stratified native validity
+ for context-sensitive computation on terms.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">2014 June 9.</span>
+ Strong qrst-normalization
+ for simply typed terms.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">2014 April 16.</span>
+ Lazy equivalence on local environments
+ added as q-step to rst-computation on closures
+ (anniversary milestone).
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">2014 January 20.</span>
+ Parametrized slicing of local environments
+ comprises both versions of this operation
+ (one from basic_1, the other used in basic_2 till now).
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">2013 August 7.</span>