In philosophy, the concept of "1+1=2" can be understood in various ways, depending on the philosophical framework or perspective one uses. Here are a few examples:

Platonism: In Platonic philosophy, mathematical concepts like "1," "2," and addition are seen as existing independently of human minds or physical reality, in a realm of pure ideas or Forms. So, for a Platonist, 1+1=2 is a necessary and timeless truth that holds true in all possible worlds or realities.

Logicism: In the early 20th century, some philosophers and mathematicians tried to reduce mathematical concepts and reasoning to logical principles, such as set theory or predicate logic. For a logicist, 1+1=2 would be derived from logical rules and definitions, such as the Peano axioms mentioned earlier.

Intuitionism: Intuitionism is a philosophy of mathematics that rejects the idea of mathematical concepts existing independently of human intuition or construction. Instead, mathematical knowledge is seen as the product of human mental activity, such as mental constructions or operations. For an intuitionist, the truth of 1+1=2 would depend on the rules and conventions of the specific system or context in which it is used, rather than being a universal and necessary truth.

Overall, the question of why 1+1=2 is not 3 can be approached from different philosophical perspectives, each with its own assumptions, methods, and implications.
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