ALF ("Another logical framework") is a structure editor for monomorphic Martin-Löf type theory developed at Chalmers University. It is a predecessor of the Alfa, Agda, Cayenne and Coq proof assistants and dependently typed programming languages.

1. Alf is one of the main characters in the 80s sitcom.
   阿爾夫是80年代情景喜劇中的主要角色之一。
2. My friend named his dog Alf after his favorite TV show character.
   我朋友以他最喜歡的電視角色命名他的狗為阿爾夫。