Ruby 3D Vector w/UTF

vector3.rb

#!/usr/bin/env ruby
# encoding: utf-8

class Vector
  attr_accessor :x, :y, :z

  def initialize(x,y,z)
    @x,@y,@z = x,y,z
  end

  def to_s
    "<#{x}, #{y}, #{z}>"
  end

  def ×(v)
    Vector.new(
               y*v.z - z*v.y,
               z*v.x - x*v.z,
               x*v.y - y*v.x
               )
  end

  def •(v)
    x*v.x + y*v.y + z*v.z
  end
end

a = Vector.new(1,0,0)
b = Vector.new(0,1,0)

puts a.× b
puts a.• b