# [Pl-seminar] Semantics Seminar Schedule

**Mitchell Wand
**
wand at ccs.neu.edu

*Sat, 26 Jan 2002 00:05:01 -0500 (EST)*

NU Programming Languages Seminar
Wednesday, January 30, 2002, 10:30-12:30
306 Egan Hall, Northeastern University
(building 62 on the unfortunate map at http://www.neu.edu/maps/maps.html)
Mitchell Wand
will continue his presentation on
Small-step Flow Analysis: But Wait, There's More!
0CFA is known to be sound with respect to a variety of semantics: big
and small step; call-by-name, call-by-value, and unrestricted beta.
We will sort out some of these soundness results.
We show that the soundness theorem a la Palsberg 95 (small-step,
substitution semantics) is strictly weaker than the the soundness
theorem a la Palsberg 94/Wand-Steckler 94 (big-step, environment
semantics).
[On 1/30 we'll start here:]
We retrieve the power of environment semantics for a small-step
semantics by showing the soundness of 0CFA for a small-step
environment/continuation machine. We then extend the proof to cover a
store; providing a simpler alternative to the semantics of (Flanagan
and Felleisen 95).
The presentation will be largely self-contained if you weren't here on
the 23rd.
Upcoming presentations:
2/6 NUCCS PL Day! See http://www.ccs.neu.edu/home/matthias/PL/
2/13 Greg Sullivan
Most meetings will be 1030-1230 in 306 EG.