Its function is similar to "If … then …".
Look at the first half first.
The subject of the first half sentence is "array".
All forms of "de" end with "de", which is an adjective phrase. Here as an attribute, it is used to modify and limit the "array".
The predicate of the first half sentence is "component" and the object is "set A".
Look at the second half.
As the subject said, the second half of the sentence omits the subject. If you want to add a complete sentence, it should be: "Then please judge whether it is an element in set A?"
The subject of the second half sentence is the omitted "problem solver";
Predicate should be "judgment";
But the object is not "is it an element in set A".
Because the sentence structure of "Is it an element in set A" is complete.
Its subject is "6-2", its predicate is "yes" and its object is "element"; Like the first half of the sentence, "in set A" ends with "de", which is an attribute, modifying and defining "element".
Obviously, the "verdict" is followed by another sentence.
This kind of sentence is one of the complex sentences mentioned by the subject.
This is called an object clause.
If the subject is interested, you can analyze the following sentences:
How do I know if you know?
PS: This is also an object clause.