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 Revival
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17h
reviewed Approve Slope and intercept word problem
1d
comment Embedding of a topological manifold
This might be of interest: mathoverflow.net/questions/34658/…
1d
comment Embedding of a topological manifold
If anything $N$ would have to be larger, because every smooth manifold is a topological manifold.
1d
revised Trapezoidal Rule yielding the exact value of the integral
deleted 1 character in body
Aug
27
revised Prove that $\det(I-CD)=\det(I-DC) $
added 2 characters in body
Aug
26
comment An exponential equation
@user264653 It doesn't say $g(x)<0$, it says $g'(x)<0$.
Aug
26
answered An exponential equation
Aug
26
comment An exponential equation
There is a solution at $x=3$.
Aug
23
answered Show that if $A\cup B = A\vee B$ for subgroups $A$ and $B$, then $A\subseteq B$ or $B\subseteq A$
Aug
23
revised $n$-th derivative of $(ax+b)^{-m}$
added 2 characters in body; edited title
Aug
21
comment Eccentricity of $9x^2 + 4y^2 - 24y + 144 = 0$
Unless $x$ and $y$ can be complex numbers, there are no $x$ and $y$ that solve the equation $$\frac{x^2}{12}+\frac{(y-3)^2}{27}=-1$$ as both terms on the left hand side have to be bigger than or equal to $0$.
Aug
20
awarded  Revival
Aug
20
answered Uniqueness of isomorphism to linear spaces.
Aug
10
revised A proof that the operation of concatenation has an identity element
added 34 characters in body
Aug
9
comment What does it mean to say that a given theory is weak or strong?
@Bill You are correct.
Aug
9
answered What does it mean to say that a given theory is weak or strong?
Aug
2
answered If $UT=TU $, why is the range of $U $ invariant under $T $?
Jul
30
comment Differential and partial derivatives : is it OK to divide by $ \mathrm dT $?
Knowing how you arrived at your equation might be helpful.
Jul
24
answered Can anyone provide a proof that a compact set in metric space $(X,d)$ is bounded using..
Jul
23
awarded  Pundit