require "Set"
class Vorlesung
attr_reader :name
def initialize(name)
@name = name
end
def eql?(other) return true if self.equal?(other) return false if self.class != other.class return self.name.eql?(other.name)
end
def to_s
return "#{self.class} #{name.to_s}"
end
def inspect
return to_s
end
end