I know about the Plimpton 322 tablet and Pythagorean triples. But can we be sure that this is the first instance of mathematical reasoning? I am talking about notions, propositions, or questions about mathematics.
I ask you if you can say what the milestone of mathematical reasoning or mathematical knowledge is, as accepted by the scientific community.
I have two ideas as to what ancient notions of mathematics could be like. Let's say that humans were a band of Paleolithic hunters or gatherers. If the group gets $N$ items of food, then, leaving out social synergies, the appropriate distribution is the Euclidean division between the participants. If there are paintings of two animals in a cave, does this mean that Paleolithic men/women had the notion of the integer $2$? Are there scientific thoughts from the viewpoint of history of mathematics?
What is the first occurrence of mathematical reasoning or mathematical knowledge?