8.4.3 Can you answer these questions?

8.4.3.1 Center proof goal and "QED" below prooftree

https://tex.stackexchange.com/landing/r/digest?cta=question&id=629931

I am using the Clea F. Rees' prooftrees package in order to typeset tableau proofs in LaTeX. Things are working just fine, but there are two caveats I do not know how to deal with. Firstly, the "... 
[alignment] [proof-package] [prooftrees]
 

asked by Vitus SchA~\[Currency]fftlein https://tex.stackexchange.com/landing/r/digest?cta=user&id=242372 1 vote

8.4.3.2 If I have a .bib file, how do I make it so only specified fields are used in a reference without manually deleting each field in the file?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=630227

I am using Mendeley to manage references for a project I am working on. It does a wonderful job of filling out each field so that details such as the DOI, page numbers, authors etc are accounted for. ... 
[bibtex] [formatting] [citing]
                                                                                  

                                                                                  
 

asked by t.o. https://tex.stackexchange.com/landing/r/digest?cta=user&id=163690 1 vote

8.4.3.3 Modify .bst file to remove comma after volume page

https://tex.stackexchange.com/landing/r/digest?cta=question&id=630392

I am using a slightly edited aasjournal.bst file, which I have to use for some reason, e.g., to output the bibliography on a "single line". As it is, the style seems to output a comma after ... 
[bibliographies] [natbib] [aastex] [bst]
 

asked by Py-ser https://tex.stackexchange.com/landing/r/digest?cta=user&id=56250 1 vote