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  2. abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange

    Jan 15, 2013 · Possible Duplicate: How do I convince someone that 1 + 1 = 2 1 + 1 = 2 may not necessarily be true? I once read that some mathematicians provided a very length proof of 1 + …

  3. logic - Is 1+1 =2 a theorem? - Mathematics Stack Exchange

    A theorem is defined to be a mathematical statement that is proven to be true. The statement $1+1=2$ has definitely been proven in the history of mankind (Russel and Whitehead had …

  4. Is 1+1=2 true by definition - Philosophy Stack Exchange

    Nov 20, 2013 · We see here that 1+1=2 is true in this interpretation, as a consequence of two axioms and the two definitions 1=S (0) and 2=S (S (0)). Because there were two axioms …

  5. Formula for $1^2+2^2+3^2+...+n^2$ - Mathematics Stack Exchange

    (n + 1)3 −n3 = 3n2 + 3n + 1 (n + 1) 3 n 3 = 3 n 2 + 3 n + 1 - so it is clear that the n2 n 2 terms can be added (with some lower-order terms attached) by adding the differences of cubes, giving a …

  6. Formula for the $n$th term of $1, 2, 2, 3, 3, 3, 4, 4 ,4, 4, 5,

    Sep 30, 2014 · Further explanations: We have a sequence {an} {a n} such that a0 = 1 a 0 = 1, a1 =a2 = 2 a 1 = a 2 = 2, a3 =a4 =a5 = 3 a 3 = a 4 = a 5 = 3, etc, and we want to have a general …

  7. Why Does i^2 Equal -1? Explained - Physics Forums

    Oct 20, 2014 · You will understand better when you study Trigonometry. More simply, we can have a solution for x 2 +1=0. x 2 =-1 x=±√ (-1) and a variable is assigned to this solution, …

  8. what is 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + 1/7 - 1/8 +1/9

    Nov 28, 2019 · Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and …

  9. Sum of 1 + 1/2 + 1/3 +.... + 1/n - Mathematics Stack Exchange

    3 One can write 1 + 1 2 + 1 3 + ⋯ + 1 n = γ + ψ(n + 1) 1 + 1 2 + 1 3 + + 1 n = γ + ψ (n + 1) where γ γ is Euler's constant and ψ ψ is the digamma function. Of course, one reason for creating the …

  10. Prove that $1^3 + 2^3 + ... + n^3 = (1+ 2 + ... + n)^2$

    This is what I've been able to do: Base case: n = 1 n = 1 L. H. S: 13 = 1 L H S: 1 3 = 1 R. H. S: (1)2 = 1 R H S: (1) 2 = 1 Therefore it's true for n = 1 n = 1. I.H ...

  11. Writing 1+1= 2 in a complicated way - Mathematics Stack Exchange

    I understand steps one and two, but when it comes to the third step, where he "cleans up" again, I get lost in thought. I would Google this, but I do not know the technical term, hence the title …