reason why I have decided to write is because I am currently learning Intervals and don't understand when you add ( ) or [ ]. I understand () is for open intervals, [ ] is for closed, but when task includes mixed brackets....well for me represents the problem. I am kindly asking for help actually if someone could explain me for these two examples on pictures, where it says to write down for union and intersection interval because I still do not understand final results (why is it in first example the result (-1 ,0) and not [-1,0] or something else, as well why is it in second example the result everything although there is a gap between 3 and 5).
PS: Tasks are in Slovenian language because I am from Slovenia :D
1. The intersection of two sets consists of all points that are in both sets, set1 and set2. -1 is not contained in set2, therefore not in the intersection. 2. I don't understand what the problem here is. In your question do state the problem precisely, in German or English, in the original form (translated) - what is given, what precisely is the task.