Alan D. Logan

activity

20122025

most cited400%/W second harmonic conversion efficiency in

14 μ m

-diameter gallium phosphide-on-oxide resonators

67 citations · 103 across the 16 of their papers we have counts for

collaborators

Showing 2017 · math.GRShow all

2 papers · 2 filters

math.GR2017★ 4 cited

The residual finiteness of (hyperbolic) automorphism-induced HNN-extensions

Alan D. Logan

We classify finitely generated, residually finite automorphism-induced HNN-extensions in terms of the residual separability of a single associated subgroup. This classification pro…

math.GR2017

Every group is the outer automorphism group of an HNN-extension of a fixed triangle group

Alan D. Logan

Fix an equilateral triangle group $T_{i} = ⟨ a, b; a^{i}, b^{i}, (ab)^{i} ⟩$ with $i \geq 6$ arbitrary. Our main result is: for every presentation $P$ of every countable g…