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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
Jul
1
comment Defining exponentiation on the integers
@Cameron Buie: yes, I forgot them. Thx
Jul
1
revised Defining exponentiation on the integers
added binomial coeffs in formula
Jul
1
revised Defining exponentiation on the integers
added binomial coeffs in formula
Jul
1
answered Defining exponentiation on the integers
Jul
1
comment Defining exponentiation on the integers
of course you could. use the biomial theorem.
Jun
30
revised Logic problem involving sum of digits
typos
Jun
30
comment Logic problem involving sum of digits
@Mike: you are right, but I mentioned that one can construct other solutions by adding/removing zeros
Jun
30
comment Complex numbers $z$ satisfying $|z−a|+|z+a| = 2|b|\Leftrightarrow |a|\le |b|$.
If you draw the complex numbers as points in the plane your equation describes what kind of figure?
Jun
30
comment Complex numbers $z$ satisfying $|z−a|+|z+a| = 2|b|\Leftrightarrow |a|\le |b|$.
What is the first implication and what is the second one? Please show us the prove.