This paper is the first of a two part series. In this paper, we first prove that the variety of dually quasi-De Morgan Stone semi-Heyting algebras of level 1 satisfies the strongly blended ∨-De Morgan law introduced in [20]. Then, using this result and the results of [20], we prove our main result which gives an explicit description of simple algebras(=subdirectly irreducibles) in the variety o...

BACKGROUND: Milligan-Morgan excision haemorrhoidectomy remains a very popular treatment modality for third and fourth degree hemorrhoids due to its cost effectiveness and better long-term results. Ferguson haemorrhoidectomy is believed to result in less postoperative pain because of a closed wound. The aim of this study was to compare the effectiveness of Milligan-Morgan excision haemorrhoidect...

Abstract Every application of soil erosion models brings the need proper parameterisation, that is, finding physically or conceptually plausible parameter values allow a model to reproduce measured values. No universal approach for calibration and validation exists, as it depends on model, spatial temporal resolution nature datasets used. We explored some existing options modelling exemplary wi...

In the paper, the notion of a contact relation on de Morgan algebra is defined, the algebraic structure of all contact relations and the connection to the set of all close, reflexive and symmetric relations on all maximal filters are investigated. 2010 AMS Classification: 06D30, 06F30, 54E05, 54H12

AT the urging of Professor G. M. McKinley, who sophila genetics had become too complex for him. Mortaught genetics at the University of Pittsburgh, I gan was a discoverer, not a bookkeeper, and after the applied for graduate school at Caltech, was accepted, basic findings of Drosophila genetics had been made, he and arrived in Pasadena for the opening of the fall term left the subject in the co...

It is shown that a random restriction leaving only a fraction " of the input variables unassigned reduces the expected de Morgan formula size of the induced function by a factor of O(" 5? p 3 2) = O("