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Nov
5
revised Give a counterexample to show that $(AB)^{-1} \neq A^{-1}B^{-1}$
edited title
Nov
4
comment Can basis vectors have fractions?
@tokola If the vectors in the basis you found are just scalar multiples of the vectors in the solution from the book you should end up with the same diagonal matrix that they have. So maybe you made a mistake when calculating $P^{-1}AP$ or when calculating the power you mention. By the way, funny nickname.
Nov
4
revised Prove that g(y)>0 for all y in the real numbers
This has nothing to do with proof theory.
Nov
4
comment Triangle inequality
Related
Nov
4
revised Let $V$ be a finite dimensional real vector space and let $A:V\to V$ be a linear map such that $A^2=A$
added 143 characters in body
Nov
3
answered Let $V$ be a finite dimensional real vector space and let $A:V\to V$ be a linear map such that $A^2=A$
Nov
1
comment On Fatou's Lemma
Limit may not always exist.
Oct
31
awarded  Popular Question
Oct
29
comment A sequence of truncates of $f$
I formatted a bit your post. Still $f_A$ isn't well defined.
Oct
29
revised A sequence of truncates of $f$
Formatting
Oct
29
comment How to factor $x^{4}-22x^{2}+9$ over real numbers?
This question is far more specific than what the original title suggested.
Oct
29
revised How to factor $x^{4}-22x^{2}+9$ over real numbers?
Making a realistic title.
Oct
25
comment Product of bounded and convergent to $0$ sequence is a convergent to $0$ sequence
@GitGud Null sequence seems to mean sequence convergent to $0$.
Oct
25
revised Product of bounded and convergent to $0$ sequence is a convergent to $0$ sequence
Formatting. Improving title. Removing unnecessary (obvious) stuff .
Oct
21
comment Deduce the Bolzano-Weierstrass Theorem from the Heine-Borel Theorem
@flapjackery Not necessarily. For example if the open cover is such that each interval contains one $x_n$ then it will contain an infinite number of the $x_n$, as long as there are infinite intervals in the cover.
Oct
21
answered Deduce the Bolzano-Weierstrass Theorem from the Heine-Borel Theorem
Oct
17
awarded  Nice Answer
Oct
14
comment Finitely additive function on an infinite set, s.t., $m(A)=0$ for any finite set and $m(X)=1$ (constructive approach)
Different exercises, different questions. Would be better.
Oct
14
answered Graph of measurable function has measure 0 in the product measure space
Oct
10
revised Does there exist such sequence?
added 23 characters in body