Example of greek_abc usage

example.rb

require 'greek_abc'

abc = GreekABC::Alphabet

# Define method :Σ
define_method(abc.sigma.upper.to_sym) do |**args|
  "#{args.keys.join(' + ')} = #{args.values.sum}"
end

Σ(x: 10, y: 20) # => "x + y = 30"

###################################################

include Math
instance_variable_set(:"@#{abc.beta.lower}", 60)

sin @β # => -0.30..