algebra.rb in dydx-0.0.5

- old
+ new

@@ -1,9 +1,11 @@
 require 'dydx/algebra/formula'
+require 'dydx/algebra/inverse'
 
 require 'dydx/algebra/set'
 
+require 'dydx/algebra/operator/inverse'
 require 'dydx/algebra/operator/formula'
 require 'dydx/algebra/operator/symbol'
 require 'dydx/algebra/operator/num'
 require 'dydx/algebra/operator/general'
 
@@ -37,7 +39,18 @@
       class Sin;    include Operator::General; end
       class Cos;    include Operator::General; end
       class Tan;    include Operator::General; end
     end
     class Formula;  include Operator::Formula; end
+    class Inverse;  include Operator::Inverse; end
+
+    def inverse(x, operator)
+      if operator == :+ && x.is_0?
+        e0
+      elsif operator == :* && x.is_1?
+        e1
+      else
+        Inverse.new(x, operator)
+      end
+    end
   end
 end