6.12.3 Can you answer these questions?

6.12.3.1 An apparent bug in Geometry`ConvexHull2

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224966

I was replacing some usages of Geometry`ConvexHull2 with ConvexHullMesh and found one of my tests failing. It turned out the test asserted an incorrect expected result that agrees with the result of  ... 
[symbolic] [geometry] [computational-geometry]
 

asked by Vladimir Reshetnikov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7288 1 vote

6.12.3.2 When making a package, how can I make a function that is already used by system?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224730

Obviously, Plus[a,b] is given by Mathematica but say I have a package and I want to name a function Plus[a,b]. How can I go about making a new function without overwriting the original function  ... 
[functions] [packages] [system]
                                                                                  

                                                                                  
 

asked by Brandon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73362 2 votes

6.12.3.3 Simplifying expressions using elementary properties of integrals

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=225023

I want to be able to use Simplify (or FullSimplify) to simplify expressions involving, for example, sums of integrals, for instance turning 
$$ \int_a^b f(x)\,dx + \int_b^c f(x)\,dx $$ 
into 
$$ \int_a^c  ... 
[calculus-and-analysis] [simplifying-expressions]
 

asked by Pillsy https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=531 2 votes