10.25.3 Can you answer these questions?

10.25.3.1 In-Text Citation with Author's last name and initial letter of given name

https://tex.stackexchange.com/landing/r/digest?cta=question&id=714774

Let us say my bibliography has the following entry 
@book{Doe, 
author = {Doe, John and Carlsson, Martha}, 
year = {2013}, 
title = {title} 
} 
Using \citeauthor{Doe} will result in the output 
... 
[biblatex] [citing]
 

asked by Nuke_Gunray https://tex.stackexchange.com/landing/r/digest?cta=user&id=274873 Score of 1

10.25.3.2 Bad spacing after multicols environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=714761

I get sometimes a bad spacing at the bottom of a multicols inserted into a boxed environment (like minipage, tcolorbox or mdframed). 
For example, with a minipage (and a tight \framebox for ... 
[multicol]
                                                                                  

                                                                                  
 

asked by jlab https://tex.stackexchange.com/landing/r/digest?cta=user&id=316068 Score of 1

10.25.3.3 3D plotting with equations containing equal signs?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=714993

I have a few problems with 3D plotting, namely equations with equal signs in it. For example, x^2 + y^2 = 1 yields Package PGF Math Error: Unknown operator '=' or '=1'. Is there anyway around this ... 
[tikz-pgf] [pgfplots]
 

asked by ItsAtom https://tex.stackexchange.com/landing/r/digest?cta=user&id=318042 Score of 1