additive function
arithmetic function such that the image of the product of two coprimes is the sum of their images
en-GB/ˈædɪtɪv ˈfʌŋkʃn/
en-US/ˈædɪtɪv ˈfʌŋkʃən/
arithmetic function such that the image of the product of two coprimes is the sum of their images