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user189013
  • Member for 9 years, 6 months
  • Last seen more than 7 years ago
11 votes
4 answers
4k views

Prove that Image of a closed set is closed in isometry

4 votes
5 answers
3k views

If f is continuous does this means that the image under f of any open set is open?

2 votes
0 answers
39 views

Regular parametrised curve and its length

1 vote
1 answer
2k views

Finding minimum point of banana function using Newton's Method

1 vote
1 answer
190 views

Evaluating $\int \sin2x \sqrt{\sin^2x-\cos^3x} \, dx .$

1 vote
1 answer
337 views

How to derive the variation of parameters formula

1 vote
1 answer
83 views

Proof of $\partial A = \bar A $ \ $A ^\circ$

1 vote
1 answer
467 views

How to describe a convergent sequence in the railway metric

1 vote
2 answers
427 views

Solution of integral involving exponential and absolute values [closed]

1 vote
1 answer
370 views

Proving that a metric space of a power set is complete

1 vote
1 answer
378 views

showing $Ax=b$ has a unique solution by finding the fixed points of a function

1 vote
1 answer
174 views

Prove some identities involving interior, closure in topology

1 vote
1 answer
37 views

Prove that the condition $x(\tau)>\xi$ of a divergent integral implies that $x(t)>\xi$

1 vote
0 answers
153 views

Proof of $det(A+B)=detA + <$Cof$A,B> + <A,$Cof$B> + detB$

1 vote
1 answer
190 views

equalisers are unique up to unique homeomorphism

0 votes
1 answer
71 views

Describe the state of stress in a deformed elastic body with a given Cauchy Stress Tensor

0 votes
1 answer
60 views

Proving a map/function based on two metric spaces is continuous.

0 votes
1 answer
908 views

Green's function for the quarter plane

0 votes
1 answer
466 views

Prove that any maximal interval of existence is open

0 votes
1 answer
103 views

How to find the initial data of an initial-value problem that give a maximal solution

0 votes
2 answers
144 views

Proving $\|AB\| ≤ \|A\|\|B\|$

0 votes
1 answer
115 views

Proving a metric space is connected

0 votes
2 answers
32 views

Proving conditions on connected sets

0 votes
1 answer
81 views

Proving an equivalence relation $(A_1,B_1)$ ~ $(A_2,B_2)$

0 votes
0 answers
35 views

Solving a first order ordinary differential equation

0 votes
1 answer
215 views

How to show two sets are either open or closed in $\mathbb{Q}$?

0 votes
1 answer
1k views

How to show that the isotropic tensor of order $n$ is a multiple of the Kronecker delta?

0 votes
2 answers
206 views

Proving that a sequence is cauchy in a metric space, under a specific property.

0 votes
2 answers
412 views

proving a metric space is complete.

0 votes
1 answer
507 views

The interior of interior of a set is its interior [duplicate]