In general, Light Echoes (LE) are beautiful, rather academical and therefore unavoidably useless phenomena. In some cases, however, they can give interesting information about the environment surrounding the exploding star. After giving a brief introduction to the subject, I describe its application to the case of Type Ia Supernovae and discuss the implications for progenitors and their locatio...

The origin of Korovkin Approximation theory is the classical theorem of P.P. Korovkin (1953),which says that for a sequence (Tn) of positive linear operators on C[a, b], in order to conclude the uniform convergence of Tnf to f for all f ∈ C[a, b], it suffices to check the uniform convergence only for the three functions f ∈ {1, x, x2}. Starting from this beautiful result many mathematicians hav...

We examined the effects of ceiling height and perceived enclosureddefined as perceived visual and locomotive permeabilitydon aesthetic judgments and approach-avoidance decisions in architectural design. Furthermore, to gain traction on the mechanisms driving the observed effects, we employed functional magnetic resonance imaging (fMRI) to explore their neural correlates. Rooms with higher ceili...

the sacred art of islam has undoubtedly been born with the calligraphy of the holy quran. afterwards, it was completed and evolved with decorating of this magnificent manifest. this process has had great effects on all fields of islamic art. in this research, the writer has discussed about the procedure of scribing the holy quran in the life time of the holy prophet (p.b.u.h) as well as the tim...

language and meaning are among the most important subjects which scholars have discussed since the earliest times and sometimes they have presented contradictory viewpoints about it. undoubtedly, language and meanings have a life for themselves; some of them extinguish in their lifespan and others will survive. some others undergo transformation and present themselves in new shapes. similar to ...