![Checkout](https://naologiccom.imgix.net/website-update/general/checkout.png?auto=compress&w=64&fm=png)
Start free trial
Take Naologic for a spin today, no credit card needed and no obligations.
Start free trial Question
Prolog - What is \+ in Prolog?
Answer
In Prolog, negation is symbolized by \+, a result of the issues with negation-as-failure. The symbol is a mnemonic representation of 'not provable', with \ signifying 'not' and + representing 'provable'.