User 17SI.34SA - Mathematics Stack Exchange

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7

votes

4

answers

126

views

Finding solution in naturals to $a^b=b^a$ with the help of $f(x)=\frac{\ln(x)}{x}$

calculus

mar 9 at 19:22 amWhy 53.9k

1

7

votes

2

answers

216

views

Every partial order can be extended to a linear ordering

jan 5 at 17:25 Brian M. Scott 153k

5

votes

3

answers

127

views

Is $\varsigma$ equivalence relation?

elementary-set-theory relations

apr 1 at 0:39 Community♦ 1

4

votes

1

answer

74

views

Chain of length $2^{\aleph_0}$in $ (P(\mathbb{N}),\subseteq)$

homework elementary-set-theory

dec 7 at 17:59 Asaf Karagila 90.1k

1

3

votes

3

answers

308

views

Infinite set as union of disjoint countable sets.

elementary-set-theory axiom-of-choice

dec 21 at 10:12 Asaf Karagila 90.1k

3

votes

3

answers

47

views

Nature of D-finite sets.

elementary-set-theory

dec 15 at 22:37 Saltekoff 1

2

votes

3

answers

71

views

Functional equation $f(xy)=f(x)+f(y)$

calculus functional-equations

may 4 at 1:20 Clement C. 1,278

2

votes

1

answer

68

views

Integral change of variable simple case proof

integration

apr 16 at 21:00 Halil Duru 986

2

votes

2

answers

60

views

Is $x_0$ local minimum/maximum or inflection point if $f'(x_0)=0$?

calculus

mar 9 at 16:23 Community♦ 1

1

2

votes

3

answers

164

views

Cardinality of all dense and countable sets of $\mathbb{R}$

general-topology elementary-set-theory

dec 6 at 9:21 Asaf Karagila 90.1k

2

votes

2

answers

98

views

Onto function and Power set cardinality.

homework elementary-set-theory

dec 6 at 7:30 Asaf Karagila 90.1k

2

votes

1

answer

36

views

Embedding $P(\mathbb{N})$ into $P_{\infty}(\mathbb{N})$

elementary-set-theory

nov 28 at 19:50 Asaf Karagila 90.1k

1

vote

1

answer

52

views

Proving $(\operatorname{ker}T)^{\perp}\subseteq \operatorname{Im} T^{*}$

linear-algebra

may 6 at 11:23 Scis 77

1

vote

0

answers

16

views

Darboux integrable periodic function is integrable on any closed and bounded interval

definite-integral

apr 27 at 2:53 17SI.34SA 334

1

vote

1

answer

47

views

Composition of step function with linear one.

functions

apr 15 at 15:44 Abel 3,803

1

vote

2

answers

95

views

Limit problem involving cube roots (without use of L'Hôpital's rule or Taylor series)

limit

jan 29 at 18:59 julien 22.3k

1

vote

1

answer

64

views

Well-ordering the set of all finite sequences.

elementary-set-theory

jan 5 at 0:36 Asaf Karagila 90.1k

1

vote

2

answers

72

views

Subset of $(P(\mathbb{N}),\subseteq)$

elementary-set-theory

dec 27 at 9:31 Asaf Karagila 90.1k

1

vote

1

answer

81

views

Unbounded family of functions from $\mathbb{N}$ to $\mathbb{N}$ [duplicate]

elementary-set-theory

nov 23 at 22:52 Andres Caicedo 24.4k

1

vote

1

answer

60

views

Union of equivalence relation

elementary-set-theory relations equivalence-relations

nov 5 at 11:47 coffeemath 6,538

1

vote

1

answer

61

views

Proving via axioms, that for given set, $A$, exist a set $\{(X,Y): X\subset Y \subset A \}$

elementary-set-theory

oct 26 at 17:35 Matt N. 15.2k

1

vote

2

answers

107

views

Question on Transitive Set.

elementary-set-theory

oct 26 at 12:23 Brian M. Scott 153k

0

votes

1

answer

34

views

Matrix with elements of inner product.

linear-algebra

may 6 at 8:49 user75769 23

0

votes

2

answers

42

views

Showing that two matrices are similar

homework linear-algebra

apr 10 at 16:09 clintonmonk 26

0

votes

2

answers

32

views

If $f$ is differentiable and $x_0=0$ is asymptote then $\lim_{x\to 0 }f'(x)$ exists.

calculus

mar 9 at 18:02 user1551 16.5k

0

votes

2

answers

55

views

Where the set of maximal chains is $2^{\aleph_0}$

elementary-set-theory

feb 8 at 22:22 Asaf Karagila 90.1k

0

votes

1

answer

73

views

Proving of existence of limit ordinal

homework elementary-set-theory order-theory ordinals

jan 9 at 12:03 Asaf Karagila 90.1k

0

votes

1

answer

62

views

Proving that an initial infinite ordinal is a limit ordinal

homework elementary-set-theory ordinals

jan 7 at 0:23 Asaf Karagila 90.1k

0

votes

2

answers

73

views

Cardinality calculation

homework elementary-set-theory cardinals

dec 13 at 19:44 Matt N. 15.2k

0

votes

1

answer

56

views

Deducing $|B^A|+|B^A|=|B^A|$ from $|A|+|A|=|A|$,

homework elementary-set-theory cardinals

dec 13 at 17:53 Asaf Karagila 90.1k

17SI.34SA

39 Questions