I do not get why you mean by plus being injective. `plus(1, 2, C). C = 3.` `plus... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

Hendrikto on Dec 5, 2017 | parent | context | favorite | on: Introduction to logic programming with Prolog

I do not get why you mean by plus being injective.

`plus(1, 2, C). C = 3.`

`plus(0, 3, C). C = 3.`

Isn't that a counterexample, showing how it is not injective?

mathetic on Dec 5, 2017 [–]

Yes, I was thinking total with respect to _intuitive_ arguments, but wrote injective. Sorry.

Consider applying for YC's Fall 2025 batch! Applications are open till Aug 4
Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact