y_petri.rb in y_petri-2.4.3

- old
+ new
@@ -4,13 +4,11 @@
 require 'y_support/local_object'       # object aware of its creation scope
 require 'y_support/respond_to'         # Symbol#~@ + RespondTo#===
 require 'y_support/name_magic'         # naming by assignment & more
 require 'y_support/unicode'            # ç means self.class
 require 'y_support/typing'             # run-time assertions
-require 'y_support/try'                # increased awareness in danger
 require 'y_support/core_ext'           # core extensions
 require 'y_support/stdlib_ext/matrix'  # matrix extensions
-require 'y_support/abstract_algebra'   # 
 require 'y_support/kde'                # popup file with kioclient
 
 # ActiveSupport components:
 require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/array/extract_options'