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 Jul 10 revised Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing added 171 characters in body Jul 10 answered Exercise 1 on page 10 in Naive Set Theory, following Axiom of Pairing Jul 10 comment Interchanging order of summation mechanically "No thinking required here, just algebra" is not true. Actually your result is ok. But if you dont know if the rules that you apply are allowed, you dont know if the result is true. Simply doing some algebra on parts of yor graphic (your summation formula) does not guarantee a correct result Jul 10 comment Interchanging order of summation mechanically you are interchanging two lim operation. Can you tell me why this is allowed here? Jul 10 comment Interchanging order of summation mechanically The $i$ in your first and second formula does not make sense to me. Is this a constant? Jul 8 comment Set theory formula Tjis may be a useful advice for the OP but it is not an answer to the question. Jul 7 revised Find integer solution of sysem of quadratic equations edited title Jul 7 reviewed Edit Count the number of integer solutions of a linear equation Jul 7 revised Count the number of integer solutions of a linear equation made language a bit clearer Jul 6 comment Squaring both sides of an inequality: attempt to prove a general rule @AlexanderVigodner; I can't see any difference between your proof and the proof of the OP excep that the OP's proof is more wordy. Or do I miss something? Jul 6 comment What does it even mean to say 'preserve structure'? source:me seems not to be a valid URL Jul 6 comment What does it even mean to say 'preserve structure'? if you cite another source it woul be fine if you provide a link to the source. Jul 4 revised Solving an equation that contains a logarithm more information in the title Jul 4 comment Are there numbers such that A + B = 10A+B? Did you asked which two 2-digit numbers AB and CD sum up to a 4-digit number ABCD in the first title of you question? Jul 4 revised Solving an equation that contains a logarithm changed for,ulation Jul 4 comment Solving an equation that contains a logarithm I was not satisfied with the formulation of the problem. My English is not very good, but I think 'express' is an appropriate term . If it not, please ´help tofind the right word. Jul 4 revised Solving an equation that contains a logarithm changed for,ulation Jul 4 comment Resultant Temperature 14*m_1 + 38*m_3 = 28*(m_1 + m_3) means that the resultant temperature is 28C if the temperature of the first liquid was 14C and the third was 38C. The calculation is right but you answered another question. Jul 3 reviewed Reject Group Actions: Verify a Bijective Correspondence Jul 1 revised Defining exponentiation on the integers added binomial coeffs in formula