7.22.1 Top new questions this week

7.22.1.1 very simple but unexpected aspect of Function[ ]

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250254

I've always thought 
 (2#+1)& 
 
and 
 Function[x,2x+1] 
 
are interchangeable in common sense. But, 
... 
[functions] [function-construction] [variable-definitions] [built-in-symbols]
 

asked by imida k https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34532 7 votes

answered by Lukas Lang https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36508 13 votes

7.22.1.2 OptionValue doesn't work if a local variable has the same name as the function itself

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250205

The following innocent-looking code results in error. 
... 
[options] [scoping]
 

asked by felix https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73581 7 votes

answered by Leonid Shifrin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81 11 votes

7.22.1.3 Defining mesh size for NDSolve

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250264

I want to see the effect of mesh size on the solution curves while simulating convection-diffusion - point sink via NDSolve FEM. 
In the following code (ref also related to this post): 
I'd like to know ... 
[differential-equations] [numerical-integration] [interpolation] [finite-element-method] [mesh]
 

asked by Natasha https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=58343 6 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 8 votes

7.22.1.4 3D mouse compatibility with Mathematica 12

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250285

I am interested in a purchasing a 3D mouse to navigate 3d Mathematica graphics.  I am interested in the Spacemouse Wireless (by 3Dconnexion) found here: 
https://3dconnexion.com/us/product/spacemouse-... 
[graphics3d] [compatibility] [controller]
 

asked by Michael McCain https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=33996 6 votes

7.22.1.5 Group terms in a large expression based on their minimum variable dependencies

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250391

Suppose I have a very large expression,  myEq[x1,x2,x3,x4]  in four variables,  x1 ,  x2 , ... 
[algebra]
 

asked by David G. Stork https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9735 4 votes

answered by Lukas Lang https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36508 1 vote

7.22.1.6 Airy function zeros, conflict (error?) between Wolfram Functions vs. Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250406

According to functions.wolfram.com, the zeros of the Airy function $\operatorname{Ai}(z)$ occur at $z_k=f\left(\tfrac{3\pi}{8}(4k-1)\right)$ for $k\in \mathbb{N}$ where 
 
$f(d)=-d^{2/3} \left(1 + \frac{... 
[equation-solving] [numerics] [special-functions] [precision-and-accuracy]
 

asked by user47363 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=80814 4 votes

answered by J. M.'s torpor https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 5 votes

7.22.1.7 Mesh refinement along grain boundaries

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250363

I have again a mesh related question. I want to do simulations on a microstructure and therefore I have to mesh it. That works fine, but the refinement of the grain boundaries does not work and let &... 
[finite-element-method] [mesh] [mesh-connectivity]
 

asked by Max https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=68812 4 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 1 vote