Merge pull request #41 from DARPA-ASKEM/latex-style-updates

LaTeX style updates

docs/modeling/create-model-from-equations.md

@@ -139,18 +139,33 @@ The Create model from equations operator works with LaTeX equations. Before it c
     ---
 
     - Avoid the use of:
-        - Parentheses.
         - Capital sigma (`Σ`) and pi (`Π`) notations for summation and product.
         - Non-ASCII characters.
         - Homoglyphs (characters that look similar but have different meanings).
-    - To indicate multiplication, use ` * ` between scalar quantities.
+    - To indicate multiplication, use ` * `.
 
--   #### Superscripts and subscripts
+        *Recommended*: `"b * S(t) * I(t)`
+        *Not recommended*: `b S(t) I(t)`
+
+    - Rewrite expressions with negative exponents as explicit fractions.
+
+        *Recommended*: `"\\frac{{1}}{{N}}`
+        *Not recommended*: `N^{{-1}}`
+
+-   #### Parentheses
 
     ---
 
-    - To denote **indices**, use LaTeX subscripts `_` instead of superscripts and LaTeX superscripts `^`.
-    - Use **LaTeX subscripts** `_` instead of Unicode subscripts. Wrap all characters in the subscript in curly brackets `{...}`.
+    - When grouping algebraic expressions, don't use square brackets `[ ]`, curly braces `{ }`, or angle brackets `< >`. Use parentheses `( )` if needed.
+    - Expand time-dependent algebraic expressions grouped by parentheses according to the distributivity property of multiplication. 
+
+        *Recommended*: `a * S(t) * I(t) + b * S(t) * D(t) + c * A(t) * S(t)`
+        *Not recommended*: `S(t) * (a * I(t) + b * D(t) + c * A(t))`
+
+    - Don't expand constant algebraic expressions grouped by parentheses. 
+
+        *Recommended*: `a * b * (1 - c)`
+        *Not recommended*: `a ∗ b ∗ 1 − a ∗ b ∗c`
 
 -   #### Variable and symbol usage
 
@@ -166,6 +181,13 @@ The Create model from equations operator works with LaTeX equations. Before it c
     - **Replace any variant form of Greek letters** (`\varepsilon`) with their main form (`\epsilon`) when representing a parameter or variable. 
     - Don't separate equations by punctuation (commas, periods, or semicolons).
 
+-   #### Superscripts and subscripts
+
+    ---
+
+    - To denote **indices**, use LaTeX subscripts `_` instead of superscripts and LaTeX superscripts `^`.
+    - Use **LaTeX subscripts** `_` instead of Unicode subscripts. Wrap all characters in the subscript in curly brackets `{...}`.
+
 </div>
 
 ## Create the model