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We define weak 2-categories of finite dimensional algebras with bimod-ules, along with collections of operators O (c,x) on these 2-categories. We prove that special examples Op of these operators control all homological aspects of the rational representation theory of the algebraic group GL2, over a field of positive characteristic. We prove that when x is(More)
Aspects of the problem of finding approximate factors of a polynomial in many variables are considered. The idea is that a polynomial may be the result of a computation where a reducible polynomial was expected but due to introduction of floating point coefficients or measurement errors the polynomial is irreducible. Introduction of such errors will nearly(More)
A hica is a highest weight, homogeneous, indecompos-able, Calabi-Yau category of dimension 0. A hica has length l if its objects have Loewy length l and smaller. We classify hicas of length ≤ 4, up to equivalence, and study their properties. Over a fixed field F , we prove that hicas of length 4 are in one-one correspondence with bipartite graphs. We prove(More)
Once upon a time, a long time ago, the SIGCSE lists were configured to automatically delete subscribers who had "too many" delivery problems. Alas, some subscribers were inappropriately deleted. So we, the list moderators, now do deletions manually. We now receive over 300 messages each month. For example:  The email account that you tried to reach does(More)
Occupant concern about indoor air quality (IAQ) issues has led to the increased use of more effective air filters in residential heating and cooling systems. A drawback of improved filtration is that better filters tend to have more flow resistance. This can lead to lower system airflows that reduce heat exchanger efficiency, increase duct pressure that(More)
Between August-December 2014, Ebola Virus Disease (EVD) patients from Tonkolili District were referred for care to two Médecins Sans Frontières (MSF) Ebola Management Centres (EMCs) outside the district (distant EMCs). In December 2014, MSF opened an EMC in Tonkolili District (district EMC). We examined the effect of opening a district-based EMC on time to(More)
Once upon a time, a long time ago, the SIGCSE lists were configured to automatically delete subscribers who had "too many" delivery problems. Alas, some subscribers were inappropriately deleted. So we, the list moderators, now do deletions manually. We now receive over 300 messages each month. For example:  The email account that you tried to reach does(More)
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