deletions | additions       diff --git a/Second Law.tex b/Second Law.tex  index 1bf31d7..6dd3962 100644  --- a/Second Law.tex  +++ b/Second Law.tex 
...
\section{Extension to \section{Extending  the Second Law of Thermodynamics} \label{sec:t2}  \begin{enumerate}   \item \subsection{Other Reservoirs}  I want to extend the Second Law of Thermodynamics, to include not only heat and information reservoirs, but also reservoirs of other conserved quantities such as angular momentum (see \citet{Vaccaro_Barnett_2011}). What are the implications for the Second Law? Can we derive new statement of the Second Law from a Hamiltonian framework, as in \citet{2013arXiv1308.5001D}?\\ AG says such ideas are `pathological' -- they are not in the spirit of statistical mechanics, which never considers angular momentum.  \item \subsection{Reversible Computation and Maxwell's Demon}  What would be the consequences of {\it reversible computation} on the form of the Second Law given in \citet{2013arXiv1308.5001D}? A reversible computation could involve no information erasure and hence no heat dissipation. What would the consequences be for Maxwell's Demon?     According to Landauer, computer states evolve irreversibly (many-to-one processes). This means the ``informative degrees of freedom'' (IDF) entropy decreases. BUT, why are the IBF so important? They aren't physically meaningful, only meaningful to us. The {\it physical} quantity would surely be the entropy of all the DoF combined. So, the entropy of IDF is said to increase because the operation is irreversible, but could this be a value judgement?  See \href{http://www.technologyreview.com/view/422511/the-fantastical-promise-of-reversible-computing/}{here} and \href{http://www.cise.ufl.edu/research/revcomp/}{here} for reversible computing.   \end{enumerate} computing info.     I don't see how you can {\it not} lose energy when erasing a bit -- even for reversible computation, surely you just dissipate twice as much heat as before (if you go forwards then backwards)? The path is important, not just the end states.     Erasing information is irreversible. Full cycle of MD requires erasing any information that the demon wrote down. {\bf Bennet 1982 -- quantify information}. Thermodynamic entropy different from information theory entropy, as latter invokes no temperature or reservoir.       \subsection{Misc}  More reading: \citet{2013arXiv1307.2208M}