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Mathematica Special Interest Group (Northern VA and Washington DC)

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  • Subject: [mg82491] Mathematica Special Interest Group (Northern VA and Washington DC)
  • From: Bruce Colletti <vze269bv at>
  • Date: Mon, 22 Oct 2007 05:38:10 -0400 (EDT)

The Washington D.C. area Mathematica Special Interest Group will meet Friday, 26 October, 7:30 to 9:00 a.m. at the SAIC Enterprise Center building in Tysons Corner (see directions below). 

Early risers meet before 7:00 in the morning for admission at the front desk, then we have a Dutch treat breakfast downstairs.  By about 7:30 we have moved to one of the projector rooms. Meetings consist of a prepared talk, informal discussion about Mathematica programming and applications, general questions, and new business.   

The two 30-minute talks are:

Moving Mathematical Mountains and Surmounting the Challenges of Mathematica, Part II, by D. Vasholz

Abstract.  Dave continues his talk about wicked mathematical problems and their resolution by Mathematica.   

Using Group Theory to Compute Tourlength Differences, by B. Colletti

Abstract.  Bruce computes the difference between the lengths of two tours, each a solution to the multiple asymmetric Traveling Salesman Problem. "Big deal!" you may say, "Just compute each tourlength and subtract."  Well, that's the easy but computationally difficult way (when there are thousands of cities).   Here we use group theory to compute the difference (WITHOUT computing either tourlength) and to GREATLY reduce processing time.  This result is the first of many applications of group theory to tabu search methods of combinatorial optimization conducted by an AFOSR-funded DoD-University Research Consortium (of which Bruce is a co-founder).

To inquire about attending, e-mail Dan Martinez (dmartinez at or Bruce Colletti (bcolletti at  In your e-mail subject line, please include 'Mathematica SIG.' 

DIRECTIONS to 8301 Greensboro Drive, McLean VA (tall, boxy and white SAIC Enterprise Building at the corner of Westpark Drive and Greensboro Drive):  From the Beltway, go northwest on Route 7 (Leesburg Pike) and proceed past Route 123 (Chain Bridge Road).  
Turn right onto Westpark Drive (Gosnell Road in the other direction).  Turn right  at the next light onto Greensboro Drive and then right into the parking lot. Visitor's Parking is adjacent to Westpark Drive.   

A SIG representative will meet you in the lobby. 

Please arrive no later than ten minutes to seven if you wish to join us for breakfast, and no later than twenty after seven to attend the meeting only.  The desk officer will ask for a driver's license before issuing a visitor's badge. 

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