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This video is about the start learning mathematics. Here, we discuss the properties of integers. In particular, we talk how we can construct the integers from the natural numbers and how we define the addition and inverses. This whole procedure works also in general for commutative semigroups.

I hope that this helps students, pupils and others.

#StartLearningMathematics #Numbers

(This explanation fits to lectures for students in their first year of study: Mathematics for physicists, Mathematics for the natural science, Mathematics for engineers and so on)