We answer a question of Golumbic, Monma and Trotter by constructing proper tolerance graphs that are not unit tolerance graphs. An infinite family of graphs that are minimal in this respect is specified.

In 2015 the United Nations declared an ambitious programme, Sustainable Development Goals (SDGs). With similar aspirations to Universal Declaration of Human Rights in 1948, SDGs claim is make a difference terms justice and sustainability on global scale. Both UN frameworks speak imagination, but what do they (local) practice(s)? Recently was made that human rights are ‘not enough’ (Samuel Moyn)...

O presente artigo tem como objetivo apresentar a pertinência do recurso da narração tanto na representação quanto própria constituição ipseidade. Para realizar esse intento, optou-se por uma estratégia comparativa entre posição antinarrativista e narrativista no que concerne aos poderes em apreender compor o domínio das identificações. Em um primeiro momento será realizada reconstrução posições...

Charles Sims has asked whether or not, for a free group F , the lower central subgroup γn(F ) coincides with the normal closure in F of the set of basic commutators of weight n. In this paper, we will show that Sims’ question has a positive answer when n = 5. The longest part of the proof is showing that this is true when F has rank 3. Once this is known, the results for higher ranks follow fai...

The present study investigates the antioxidant potential of the ethyl acetate fraction of the aerial parts Eclipta alba L. Hassk (EAEA) which was widely used as hepatoprotective plant. EAEA was orally administered at doses of 50, 100 and 200 mg/kg for 7 days in male Charles Foster rats. The extent of hepatoprotective potential of E . alba was studied by assessing the biochemical para...

in this paper, we apply the differential transform (dt) method for finding approximate solution of the system of linear and nonlinear volterra integro-differential equations with variable coefficients, especially of higher order. we also obtain an error bound for the approximate solution. since, in this method the coefficients of taylor series expansion of solution is obtained by a recurrence r...

the effect of weak shear thickening and shear thinning on the stability of the taylor-couette flow is explored for a carreau-bird fluid in the narrow-gap limit. the galerkin projection method is used to derive a low-order dynamical system from the conservation of mass and momentum equations. in comparison with the newtonian system, the present equations include additional nonlinear coupling in ...

http://dx.doi.org/10.1016/j.ins.2014.03.083 0020-0255/ 2014 Elsevier Inc. All rights reserved. ⇑ Corresponding author. Tel.: +39 089 964255. E-mail addresses: [email protected] (I. De Falco), [email protected] (A. Della Cioppa), [email protected] (D. [email protected] (U. Scafuri), [email protected] (E. Tarantino). I. De Falco , A. Della ...

The composition graph of a family of n+1 disjoint graphs {Hi : 0 ≤ i ≤ n} is the graph H obtained by substituting the n vertices of H0 respectively by the graphs H1, H2, ..., Hn. If H has some hereditary property P , then necessarily all its factors enjoy the same property. For some sort of graphs it is sufficient that all factors {Hi : 0 ≤ i ≤ n} have a certain common P to endow H with this P ...