--- a/TODO.md	Wed Sep 09 22:00:13 2020 +0200
+++ b/TODO.md	Thu Sep 10 10:55:30 2020 +0200
@@ -16,15 +16,21 @@
  - [ ] Update how dependencies are handled for tests. This was updated in Julia v1.2 and would allow us to use test specific dev packages.
 
 ## Reasearch and thinking
- - [ ] Redo all Tensor applys to take Vararg instead of tuple of Index?
-    Have we been down that road before? Is there any reason not to do this?
+ - [ ] Use a trait to indicate if a TensorMapping uses indices with regions.
+    The default should be that they do NOT.
+        - [ ] What to name this trait? Can we call it IndexStyle but not export it to avoid conflicts with Base.IndexStyle?
+ - [ ] Use a trait to indicate that a TensorMapping har the same range and domain?
+ - [ ] Rename all the Tensor stuff to just LazyOperator, LazyApplication and so on?
+ - [ ] Figure out repeated application of regioned TensorMappings. Maybe an instance of a tensor mapping needs to know the exact size of the range and domain for this to work?
  - [ ] Check how the native julia doc generator works
     - [ ] Check if Vidars design docs fit in there
  - [ ] Formalize how range_size() and domain_size() are supposed to work in TensorMappings where dim(domain) != dim(range) (add tests or document)
+ - [ ] Create a macro @lazy which replaces a binary op (+,-) by its lazy equivalent? Would be a neat way to indicate which evaluations are lazy without cluttering/confusing with special characters.
+ - [ ] Specificera operatorer i TOML eller något liknande?
+ - [x] Redo all Tensor applys to take Vararg instead of tuple of Index?
  - [x] Should there be some kind of collection struct for SBP operators (as TensorOperators), providing easy access to all parts (D2, e, d , -> YES!
  H.. H_gamma etc.)
  - [x] Is "missing" a good value for unknown dimension sizes (of `e*g` for example)
- - [ ] Create a macro @lazy which replaces a binary op (+,-) by its lazy equivalent? Would be a neat way to indicate which evaluations are lazy without cluttering/confusing with special characters.
 
 # Wrap up task
 
@@ -45,4 +51,3 @@
 en vektor, utan randvärdet plockas ut utanför. Känns inte konsistent med övrig
 design
 
-Specificera operatorer i TOML eller något liknande?