in this paper we show that if q is a power of a prime p , then the projective special linear group psl(2, q) and the stabilizer of a point of the projective line have maximum sum element orders among all proper subgroups of projective general linear group pgl(2, q) for q odd and even respectively

We provide a new construction yielding one new and one known infinite family of optimal (n, w, 2)-optical orthogonal codes, w ∈ {4, 6}. Our construction relies on various techniques in finite projective spaces involving hyperovals in projective planes and Singer groups.

The philosophy that “a projective manifold is more special than any of its smooth hyperplane sections” was one of the classical principles of projective geometry. Lefschetz type results and related vanishing theorems were among the typically used techniques. We shall survey most of the problems, results and conjectures in this area, using the modern setting of ample divisors, and (some aspects ...

This paper outlines the use of psychological testing in a community clinic. The emphasis is on the use of projective techniques in designing treatment plans for youth in disadvantaged communities. These assessments fall into three categories of testing referrals: determining mental impairment for disability, learning disability assessments, and diagnostic clarifications and treatment recommenda...