diff --git a/lib/core/logarithm.rb b/lib/core/logarithm.rb
index 17e8745..046decf 100644
--- a/lib/core/logarithm.rb
+++ b/lib/core/logarithm.rb
@@ -10,39 +10,108 @@ module RplLang
                               'Logs on reals and complexes',
                               '( … -- ℇ ) push ℇ',
                               proc do
-                                     @stack << { type: :numeric,
-                                                 base: 10,
-                                                 value: BigMath.E( @precision ) }
-                                   end )
-        # @dictionary.add_word( 'ln',
-        #                  proc { __todo } ) # logarithm base e
-        # @dictionary.add_word( 'lnp1',
-        #                  proc { __todo } ) # ln(1+x) which is useful when x is close to 0
-        # @dictionary.add_word( 'exp',
-        #                  proc { __todo } ) # exponential
-        # @dictionary.add_word( 'expm',
-        #                  proc { __todo } ) # exp(x)-1 which is useful when x is close to 0
-        # @dictionary.add_word( 'log10',
-        #                  proc { __todo } ) # logarithm base 10
-        # @dictionary.add_word( 'alog10',
-        #                  proc { __todo } ) # exponential base 10
-        # @dictionary.add_word( 'log2',
-        #                  proc { __todo } ) # logarithm base 2
-        # @dictionary.add_word( 'alog2',
-        #                  proc { __todo } ) # exponential base 2
-        # @dictionary.add_word( 'sinh',
-        #                  proc { __todo } ) # hyperbolic sine
-        # @dictionary.add_word( 'asinh',
-        #                  proc { __todo } ) # inverse hyperbolic sine
-        # @dictionary.add_word( 'cosh',
-        #                  proc { __todo } ) # hyperbolic cosine
-        # @dictionary.add_word( 'acosh',
-        #                  proc { __todo } ) # inverse hyperbolic cosine
-        # @dictionary.add_word( 'tanh',
-        #                  proc { __todo } ) # hyperbolic tangent
-        # @dictionary.add_word( 'atanh',
-        #                  proc { __todo } ) # inverse hyperbolic tangent
+                                @stack << { type: :numeric,
+                                            base: 10,
+                                            value: BigMath.E( @precision ) }
+                              end )
 
+        # @dictionary.add_word( ['ln'],
+        #                       'Logs on reals and complexes',
+        #                       'logarithm base e',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['lnp1'],
+        #                       'Logs on reals and complexes',
+        #                       'ln(1+x) which is useful when x is close to 0',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['exp'],
+        #                       'Logs on reals and complexes',
+        #                       'exponential',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['expm'],
+        #                       'Logs on reals and complexes',
+        #                       'exp(x)-1 which is useful when x is close to 0',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['log10'],
+        #                       'Logs on reals and complexes',
+        #                       'logarithm base 10',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['alog10'],
+        #                       'Logs on reals and complexes',
+        #                       'exponential base 10',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['log2'],
+        #                       'Logs on reals and complexes',
+        #                       'logarithm base 2',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['alog2'],
+        #                       'Logs on reals and complexes',
+        #                       'exponential base 2',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['sinh'],
+        #                       'Logs on reals and complexes',
+        #                       'hyperbolic sine',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['asinh'],
+        #                       'Logs on reals and complexes',
+        #                       'inverse hyperbolic sine',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['cosh'],
+        #                       'Logs on reals and complexes',
+        #                       'hyperbolic cosine',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['acosh'],
+        #                       'Logs on reals and complexes',
+        #                       'inverse hyperbolic cosine',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['tanh'],
+        #                       'Logs on reals and complexes',
+        #                       'hyperbolic tangent',
+        #                       proc do
+
+        #                       end )
+
+        # @dictionary.add_word( ['atanh'],
+        #                       'Logs on reals and complexes',
+        #                       'inverse hyperbolic tangent',
+        #                       proc do
+
+        #                       end )
       end
     end
   end