A twistor construction of the hierarchy associated with the hyper-KK ahler equations on a metric (the anti-self-dual Einstein vacuum equations, ASDVE, in four dimensions) is given. The recursion operator R is constructed and used to build an innnite-dimensional symmetry algebra and in particular higher ows for the hyper-KK ahler equations. It is shown that R acts on the twistor data by multipli...

Defining “intelligence” exemplifies a mistake that has historical precedent: confusing the role of pre-theory and post-theory definitions. In every area, pre-theory concepts give broad directions for investigation: are the movements of heavenly bodies affected by the existence of other heavenly bodies? Post-theory concepts add precision and predictability. The mistake occurs when a successful t...

A twistor construction of the hierarchy associated with the hyper-KK ahler equations on a metric (the anti-self-dual Einstein vacuum equations, ASDVE, in four dimensions) is given. The recursion operator R is constructed and used to build an innnite-dimensional symmetry algebra and in particular higher ows for the hyper-KK ahler equations. It is shown that R acts on the twistor data by multipli...

Abstract Corpulence is an area of body-history which receiving increased attention in line with current concerns about rising obesity as well social movements champion body positivity and fat acceptance. Historians have challenged the traditional narrative that past societies being ‘fat’ was simply viewed a positive sign wealth prosperity, showing instead fatness could be criticized early sixte...

PURPOSE The present study investigated the validity of personality classification using four pillars theory, a tradition in China and northeastern Asia. MATERIALS AND METHODS Four pillars analyses were performed for 148 adults on the basis of their birth year, month, day, and hour. Participants completed two personality tests, the Korean version of Temperament and Character Inventory-Revised-...

Starting from a self-dual SU(∞) Yang-Mills theory in (2 + 2) dimensions, the Plebanski second heavenly equation is obtained after a suitable dimensional reduction. The self-dual gravitational background is the cotangent space of the internal two-dimensional Riemannian surface required in the formulation of SU(∞) Yang-Mills theory. A subsequent dimensional reduction leads to the KP equation in (...

Abstract After a thorough structural examination, “Campo del Cielo” iron meteorite found in Argentina was forged at temperatures of about 1100 °C. This is classified as an IA group coarse octahedrite. Besides Fe, it also contains 7 wt.% Ni and 1.5 Co, well small amounts Mg, Si, Al, S, P. Heat treatments above the eutectoid temperature induce α-γ transformation present (Fe,Ni) solid solution. Ow...