If sqrt of negative is less than error, set result to zero. If error has already been computed, don't override value. (cherry picked from commit a7358f7)
closed intervals when checking for conditions on relative-position. (cherry picked from commit 731ee6e)
relative-position-displacement. Unfortunately, this didn't seem to help dt6a much. (cherry picked from commit 72db95f)
(cherry picked from commit 308d54f)
lisp practice. It may be that old versions of Allegro common lisp required :user, but this change should be OK
the end: didn't know what it belonged to. Also removed a first stab at making a reference to "sentences". The reference should be eventually impelemented to avoid code duplication.
…ng intervals in elec10