Quantum materials is an umbrella term in condensed matter physics that encompasses all materials whose essential properties cannot be described in terms of semiclassical particles and low-level quantum mechanics. These are materials that present strong electronic correlations or some type of electronic order, such as superconducting or magnetic orders, or materials whose electronic properties are linked to non-generic quantum effects – topological insulators, Dirac electron systems such as graphene, as well as systems whose collective properties are governed by genuinely quantum behavior, such...

Unter Quantenmaterialien versteht man solche Materialien, deren makroskopische Eigenschaften wesentlich durch die quantenphysikalische Wellenfunktion von Elektronen geprägt werden. Dabei unterscheidet man Eigenschaften, die auf Wechselwirkungen zwischen Elektronen zurückzuführen sind (wie z. B. Ferromagnetismus, Antiferromagnetismus und Supraleitung), und Phänomene, die von dem topologischen Charakter der Wellenfunktion abhängen (wie z. B. topologische Isolatoren, Dirac-Halbmetalle, Weyl-Halbmetalle). Ein neuer Forschungszweig beschäftigt sich mit Materialien, die beide Arten von Phänomenen kombinieren…

XGBoost is an open-source software library which provides a regularizing gradient boosting framework for C++, Java, Python, R, Julia, Perl, and Scala. It works on Linux, Windows, and macOS. From the project description, it aims to provide a "Scalable, Portable and Distributed Gradient Boosting (GBM, GBRT, GBDT) Library". It runs on a single machine, as well as the distributed processing frameworks Apache Hadoop, Apache Spark, Apache Flink, and Dask.It has gained much popularity and attention recently as the algorithm of choice for many winning teams of machine learning competitions. == History... ==

La locuzione latina Graeca sunt, non leguntur - nota anche nella variante Graecum est, non legitur - si riscontra in numerosi manoscritti dell'età medievale. L'espressione, che letteralmente significa "è (scritto) in greco, non si legge", veniva inserita dagli amanuensi in sostituzione dei passi in lingua greca incontrati nel corso dell'opera di trascrizione. Essi infatti non conoscevano il greco (la cui tradizione si era persa in occidente) e, non essendo in grado di trascriverlo, si limitavano a segnalare la presenza nel testo di tali passi. Analogamente nel corso dell'insegnamento del diritto...