diff --git a/README.md b/README.md
index 6438334..3272b57 100644
--- a/README.md
+++ b/README.md
@@ -1,20 +1,25 @@
 # MathJSLab
 
-> An interpreter with language syntax like MATLAB®/Octave written in TypeScript.
+> An interpreter with language syntax like [MATLAB®](https://www.mathworks.com/)/[Octave](https://www.gnu.org/software/octave/) written in [Typescript](https://www.typescriptlang.org/).
 
 This package emulates a parser and evaluator for a subset of
 [MATLAB®](https://www.mathworks.com/)/[Octave](https://www.gnu.org/software/octave/)
 language written completely in [Typescript](https://www.typescriptlang.org/).
 
+It can run in browser environment and implements an arbitrary precision
+arithmetics using [decimal.js](https://www.npmjs.com/package/decimal.js)
+package.
+
 It uses the [Jison](https://gerhobbelt.github.io/jison/)
-[parser generator](https://en.wikipedia.org/wiki/Compiler-compiler) to create an
+[parser generator](https://en.wikipedia.org/wiki/Compiler-compiler) to
+generate a [parser](https://en.wikipedia.org/wiki/Parsing) that create an
 [AST](https://en.wikipedia.org/wiki/Abstract_syntax_tree)
-([Abstract Syntax Tree](https://en.wikipedia.org/wiki/Abstract_syntax_tree)).
+([Abstract Syntax Tree](https://en.wikipedia.org/wiki/Abstract_syntax_tree)) of input.
 
-It can run in browser environment and implements an arbitrary precision arithmetics using
-[decimal.js](https://www.npmjs.com/package/decimal.js) package. MathJSLab
-has functions to generate [MathML](https://www.w3.org/Math/) code of
-expressions parsed too.
+Other components besides the [parser](https://en.wikipedia.org/wiki/Parsing)
+are the evaluator and the [MathML](https://www.w3.org/Math/) unparser, which
+computes the inputs and generates mathematical representations of the inputs
+and results, respectively.
 
 This software is intended for educational purposes, to provide teachers and
 students with a computer aided calculation tool that is capable of running in
diff --git a/package.json b/package.json
index dfe36ae..a382193 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mathjslab",
-  "version": "1.0.20",
+  "version": "1.0.21",
   "description": "MathJSLab - An interpreter with language syntax like MATLAB/Octave",
   "main": "build/mathjslab.js",
   "types": "build/src/index.d.ts",
@@ -55,7 +55,7 @@
   "devDependencies": {
     "@types/debug": "^4.1.9",
     "@types/jest": "29.5.5",
-    "@types/node": "^20.7.1",
+    "@types/node": "^20.7.2",
     "@types/supertest": "^2.0.13",
     "@types/webpack": "^5.28.3",
     "@typescript-eslint/eslint-plugin": "^6.7.3",
diff --git a/src/evaluator.ts b/src/evaluator.ts
index ff6f985..aaa9395 100644
--- a/src/evaluator.ts
+++ b/src/evaluator.ts
@@ -349,8 +349,6 @@ export class Evaluator {
         global.EvaluatorPointer = this;
         this.exitStatus = Evaluator.response.OK;
         /* Set opTable aliases */
-        this.opTable['.+'] = this.opTable['+'];
-        this.opTable['.-'] = this.opTable['-'];
         this.opTable['**'] = this.opTable['^'];
         this.opTable['.**'] = this.opTable['.^'];
         this.opTable['~='] = this.opTable['!='];