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- Samuel A Alexander, Christine M Waldenmaier
- Journal of nematology
- 2002

Current strategies for management of Pratylenchus penetrans in both white potato and tomato consist of the use of fumigant or non-fumigant nematicides or crop rotation. The objective of this study was to determine if double-cropping African marigolds (Tagetes erecta) with potatoes or tomatoes could reduce P. penetrans populations. Plots were 10 m x 3 m… (More)

- Samuel A. Alexander
- Studia Logica
- 2014

We construct a machine that knows its own code, at the price of not knowing its own factivity.

- Samuel A Alexander
- Acta biotheoretica
- 2013

We argue that C. Darwin and more recently W. Hennig worked at times under the simplifying assumption of an eternal biosphere. So motivated, we explicitly consider the consequences which follow mathematically from this assumption, and the infinite graphs it leads to. This assumption admits certain clusters of organisms which have some ideal theoretical… (More)

- Samuel A Alexander, Arie de Bruin, D J Kornet
- Bulletin of mathematical biology
- 2015

Internodons are a formalization of Hennig's concept of species. We present an alternative construction of internodons imposing a tree structure on the genealogical network. We prove that the segments (trivial unary trees) from this tree structure are precisely the internodons. We obtain the following spin-offs. First, the generated tree turns out to be an… (More)

- Samuel A. Alexander
- Arch. Math. Log.
- 2015

- Samuel A. Alexander
- Electr. J. Comb.
- 2013

A biologically unavoidable sequence is an infinite gender sequence which occurs in every gendered, infinite genealogical network satisfying certain tame conditions. We show that every eventually periodic sequence is biologically unavoidable (this generalizes König's Lemma), and we exhibit some biologically avoidable sequences. Finally we give an application… (More)

- Samuel A. Alexander
- Studia Logica
- 2015

Reinhardt's conjecture, a formalization of the statement that a truthful knowing machine can know its own truthfulness and mechanicalness, was proved by Carlson using sophisticated structural results about the ordinals and transfinite induction just beyond the first epsilon number. We prove a weaker version of the conjecture, by elementary methods and… (More)

- S. Albert Alexander, J. Karthikeyan, A. Sivavasanth
- International Conference on Computational…
- 2007

Power Electronics is defined as electronic circuits used for electrical conversion. The conversion includes rectification and inversion. For a UPS inverter the output voltage obtained for the linear load is sinusoidal whereas for the non linear loading conditions the output voltage waveform is highly distorted. Hence it is necessary to maintain a sinusoidal… (More)

- Samuel A. Alexander
- J. Classification
- 2016

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