March 3rd, 2019, 07:16 AM  #1 
Newbie Joined: Mar 2019 From: europ Posts: 1 Thanks: 0  vocabulary
Hello and thanks for reply How do you write the set of all maps from $\mathbb {R}^*_+$ to the set of all maps from $\mathbb {R}^*_+$ to $\mathbb {R}^*_+$ like this $\left(\mathbb {R}_+^{*\ \mathbb {R}_+^*}\right)^{\mathbb {R}_+^*}$ or more Simply? is $f_{\phi}\in \left(\mathbb {R}_+^{*\ \mathbb {R}_+^*}\right)^{\mathbb {R}_+^*}$ … blablabla… 
March 4th, 2019, 02:55 PM  #2 
Member Joined: Oct 2018 From: USA Posts: 34 Thanks: 21 Math Focus: Algebraic Geometry 
I would use \displaystyle \{f : \mathbb{R}^*_+ \mapsto \{g: \; \; \mathbb {R}^*_+ \mapsto \mathbb{R}\}\} Reads like "The set of all functions f such that f maps from R to the set of all functions g such that g maps from R to R" 
March 4th, 2019, 02:57 PM  #3 
Senior Member Joined: Aug 2012 Posts: 2,306 Thanks: 706  Delimit your markup with \$ to make it render properly as I did here.

March 4th, 2019, 07:44 PM  #4  
Senior Member Joined: Sep 2016 From: USA Posts: 609 Thanks: 378 Math Focus: Dynamical systems, analytic function theory, numerics  Quote:
"Let $S$ denote the set of all maps from $\mathbb {R}^*_+$ to the set of all maps from $\mathbb {R}^*_+$ to $\mathbb {R}^*_+$."  

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