Once more on positive commutators

Positive Commutators

In this short and very elementary note, we will discuss the technique of proving estimates for solutions to certain partial differential equations using positive commutators, which is a widely used and powerful technique in particular in microlocal analysis. In order to keep the necessary prerequisites at the bare minimum, we won’t make any use of pseudodifferential operators and related microl...

Once more unto the breach, dear friends, once more.

The first issue of the World Journal of Critical Care Medicine (WJCCM), whose preparatory work was initiated on December 16, 2010, will be published on February 4, 2012. The WJCCM Editorial Board has now been established and consists of 105 distinguished experts from 27 countries. Our purpose of launching the WJCCM is to publish peer-reviewed, high-quality articles via an open-access online pub...

Once More on Dg of Chemical Reaction

In a chemical thermodynamics course many students have difficulty understanding the following equation o DG = RT ln K (1) p Even gifted students find it difficult to understand the delta function and the dimensions of K . p The ambiguity of the delta symbol in chemical thermodynamics is the major contributing factor to this lack of understanding. The IUPAC Commission on Physicochemical Symbols ...

Divided Once More

Once More With Feeling