* Bump to version 1.3.1

PacletInfo.m

@@ -4,7 +4,7 @@
 
 Paclet[
     Name -> "xTras",
-    Version -> "1.3.0",
+    Version -> "1.3.1",
     MathematicaVersion -> "6+",
     Description -> "Field theory inspired additions to xAct",
     Creator -> "Teake Nutma",

xAct/xTras/Interface.m

@@ -48,9 +48,8 @@
 ClearCurvatureRelations::usage = "\!\(\*TagBox[\(ClearCurvatureRelations[ \
 \*StyleBox[\"cd\", \"TI\"]] removes the automatic curvature relations for the \
 covariant derivative  \*StyleBox[\"cd\", \"TI\"] .\), DisplayForm]\)"; 
-ClearSymCovDCache::usage = "\!\(\*TagBox[\(ClearSymCovDCache[] clears the \
-cache used by  \*Cell[BoxData[\"SymmetrizeCovDs\"], \"InlineFormula\", \
-Rule[FormatType, \"StandardForm\"]] .\), DisplayForm]\)"; 
+ClearSymCovDCache::usage = 
+  "ClearSymCovDCache[] clears the cache used by SymmetrizeCovDs."; 
 Coefficients::usage = "Coefficients is an option for InvarLagrangian that \
 specifies the coefficients in the Lagrangian."; 
 CollectConstants::usage = "\!\(\*TagBox[\(CollectConstants[ \
@@ -468,9 +467,8 @@ contains constants (i.e. constant symbols and integers, fractions, etc), and \
 SymCovDQ::usage = "\!\(\*TagBox[\(SymCovDQ[ \*StyleBox[\"cd\", \"TI\"]] gives \
 True if  \*StyleBox[\"cd\", \"TI\"]\(\(\\ has been defined as a symmetrizable \
 covariant derivative, and False otherwise.\)\)\[LineSeparator] SymCovDQ is \
-also an option for  \*Cell[BoxData[\"DefCovD\"], \"InlineFormula\", \
-Rule[FormatType, \"StandardForm\"]]\(\(\\ specifying whether the derivative \
-to be defined is symmetrizable or not.\)\)\), DisplayForm]\)"; 
+also an option for DefCovD specifying whether the derivative to be defined is \
+symmetrizable or not.\), DisplayForm]\)"; 
 SymmetricSpaceRules::usage = "\!\(\*TagBox[\(SymmetricSpaceRules[ \
 \*StyleBox[\"cd\", \"TI\"], \*StyleBox[\"K\", \"TI\"]] produces replacement \
 rules for the curvature tensors of the covariant derivative  \
@@ -573,9 +571,8 @@ contains constants (i.e. constant symbols and integers, fractions, etc), and \
 $AutoSymmetrizeCovDs::usage = "$AutoSymmetrizeCovDs is a boolean variable \
 determining whether all symmetrizable covariant derivatives are automatically \
 symmetrized or not. The default is False."; 
-$SymCovDCache::usage = "\!\(\*TagBox[\($SymCovDCache stores the cache used by \
- \*Cell[BoxData[\"SymmetrizeCovDs\"], \"InlineFormula\", Rule[FormatType, \
-\"StandardForm\"]] .\), DisplayForm]\)"; 
+$SymCovDCache::usage = 
+  "$SymCovDCache stores the cache used by SymmetrizeCovDs."; 
 $TensorWrapperColor::usage = "$TensorWrapperColor is a global variable \
 specifying the color of the parentheses surrounding the formatting of a \
 TensorWrapper expression."; 

xAct/xTras/Kernel/init.m

@@ -20,7 +20,7 @@
 (*                   *)
 (*********************)
 
-xAct`xTras`$Version = {"1.3.0.1", {2014, 2, 13}};
+xAct`xTras`$Version = {"1.3.1", {2014, 2, 22}};
 xAct`xTras`$xTensorVersionExpected = {"1.0.5", {2013, 1, 27}};
 xAct`xTras`$SymManipulatorVersionExpected = {"0.8.5", {2013, 4, 13}};
 xAct`xTras`$MathematicaVersionNeeded = 6.;

xAct/xTras/xTras.History

@@ -1,6 +1,17 @@
 xTras changelog
 ===============
 
+v1.3.1, 2014-02-22
+------------------
+
+  * Added the function ConstantSymbolsOf.
+  * Added possibility (controlled by the variable $AutoSymmetrizeCovDs) 
+    to automatically symmetrize covariant derivatives.
+  * Added caching to SymmetrizeCovDs, controlled by the "UseCache" option. 
+  * Improved algorithm for symmetrizing covariant derivatives in the case 
+    when there is no torsion and the derivative is metric-compatible.  
+  * Perturbation no longer expands symmetrized covariant derivatives.
+
 v1.3.0, 2014-02-10
 ------------------