Question

justification of simple idea involving union

score 24 · Answer 1 · 2026-04-17 15:44:08

24

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justification of simple idea involving union

Published on 17 Apr 2026 - 15:44

score 82 · Answer 2 · 2026-04-16 09:39:05

82

Views

Not sure how to solve $\lim_\limits{x\to0}{{\sqrt{x^2+1}-1}\over\sqrt{x^2+16}-4}$

Published on 16 Apr 2026 - 9:39

score 45 · Answer 3 · 2026-04-14 16:33:50

45

Views

Proving that $(a,b)$ is $F_{\sigma},\forall a,b\in\mathbf{R}$

Published on 14 Apr 2026 - 16:33

score 180 · Answer 4 · 2026-04-16 13:05:21

180

Views

If natural number $n$ doesn't has the form of $k^{m}$, for natural $k$ and $m$, then $x^{m}=n$ has no rational root.

Published on 16 Apr 2026 - 13:05

score 420 · Answer 5 · 2026-04-12 22:50:08

420

Views

How can I prove that following Statements are true or false?

Published on 12 Apr 2026 - 22:50

score 647 · Answer 6 · 2026-04-17 14:11:26

647

Views

IMO 2011: Prove that, for all integers $m$ and $n$ with $f(m)<f(n)$, the number $f(n)$ is divisible by $f(m)$

Published on 17 Apr 2026 - 14:11

score 41 · Answer 7 · 2026-04-17 10:18:10

41

Views

Differences of between ''either $f(x)=0$ for all $x$ or $g(x)=0$ for all $x$'' AND ''for all $x$ either $f(x)=0$ or $g(x)=0$''

Published on 17 Apr 2026 - 10:18

score 50 · Answer 8 · 2026-04-16 14:01:39

50

Views

Stuck on a term in $Var[\hat{\beta_o}]$ Proof

Published on 16 Apr 2026 - 14:01

score 257 · Answer 9 · 2026-04-16 05:30:45

257

Views

Prove $\lim_{x \rightarrow 3}x^2=9$ via delta epsilon

Published on 16 Apr 2026 - 5:30

score 36 · Answer 10 · 2026-04-16 13:56:19

36

Views

Parameters A and B must be determined such that for each x∈ℝ \ {1, -1, -2} the following equation is satisfied:

Published on 16 Apr 2026 - 13:56

score 62 · Answer 11 · 2026-04-11 03:17:49

62

Views

General term for the sum $\sum \sin(k)$

Published on 11 Apr 2026 - 3:17

score 49 · Answer 12 · 2026-04-12 10:28:04

49

Views

Does this follow from congruence?

Published on 12 Apr 2026 - 10:28

score 30 · Answer 13 · 2026-04-11 11:44:56

30

Views

proof on equality of sets

Published on 11 Apr 2026 - 11:44

score 19 · Answer 14 · 2026-04-16 05:57:01

Let $t_n$ be a convergent sequence and suppose that $\lim(t_n)>a$. Prove there exists a number $N$ such that $n>N$ implies $t_n>a$.

score 59 · Answer 15 · 2026-04-14 18:14:43

59

Views

Is this proof of $A \cup (B - (A \cap B)) \subseteq A \cup B$

Published on 14 Apr 2026 - 18:14

List Question

justification of simple idea involving union

Not sure how to solve $\lim_\limits{x\to0}{{\sqrt{x^2+1}-1}\over\sqrt{x^2+16}-4}$

Proving that $(a,b)$ is $F_{\sigma},\forall a,b\in\mathbf{R}$

If natural number $n$ doesn't has the form of $k^{m}$, for natural $k$ and $m$, then $x^{m}=n$ has no rational root.

How can I prove that following Statements are true or false?

IMO 2011: Prove that, for all integers $m$ and $n$ with $f(m)<f(n)$, the number $f(n)$ is divisible by $f(m)$

Differences of between ''either $f(x)=0$ for all $x$ or $g(x)=0$ for all $x$'' AND ''for all $x$ either $f(x)=0$ or $g(x)=0$''

Stuck on a term in $Var[\hat{\beta_o}]$ Proof

Prove $\lim_{x \rightarrow 3}x^2=9$ via delta epsilon

Parameters A and B must be determined such that for each x∈ℝ \ {1, -1, -2} the following equation is satisfied:

General term for the sum $\sum \sin(k)$

Does this follow from congruence?

proof on equality of sets

Let $t_n$ be a convergent sequence and suppose that $\lim(t_n)>a$. Prove there exists a number $N$ such that $n>N$ implies $t_n>a$.

Is this proof of $A \cup (B - (A \cap B)) \subseteq A \cup B$

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