I am really struggling with understanding the difference between these two. From my textbook, it essentially describes the difference by saying

a language is co-turing recognizable if it is complement of a turing-recognizable language.

I guess the part of this definition I don't understand is: what does it mean when it is a complement of a turing-recognizable language?

How exactly do you determine if it is a complement of another language?

theory turing-machines computation-theory
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