User Dan Öz

11 votes

5 answers

842 views

What is the relation between the high school definition of a vector and the abstract algebra definition?

asked Jul 30, 2022 at 15:48

5 votes

1 answer

674 views

What is the difference, geometrically, between row vectors and column vectors?

asked Jul 27, 2022 at 16:19

5 votes

2 answers

132 views

Confusion on the definition of the inverse function

asked Dec 6, 2022 at 18:52

3 votes

2 answers

195 views

What is the intuition behind the probability intersection formula?

asked Apr 19, 2022 at 9:20

3 votes

1 answer

127 views

Axiomatic derivation of conditional from biconditional

asked Nov 2, 2022 at 17:38

2 votes

2 answers

610 views

Proof in Peano Arithmetic

asked Nov 8, 2022 at 15:46

2 votes

3 answers

585 views

How to formulate an induction principle for the set of all integers?

asked Oct 6, 2022 at 15:43

1 vote

1 answer

27 views

How to think about changes to the median

asked Oct 24, 2022 at 17:13

1 vote

1 answer

56 views

Simple proof of $\phi \rightarrow \neg \neg \phi$

asked Nov 17, 2022 at 12:44

1 vote

2 answers

112 views

If there is an surjection $f : \Bbb{Z}^+ \to a$, then there is an injection $f : a \to \Bbb{Z}^+$ [duplicate]

asked Dec 7, 2022 at 18:48

1 vote

1 answer

22 views

Does my proof that the recurrence $T(n) = T(\frac{n}{2}) + d = \Theta(lgn)$work?

asked Mar 2 at 14:47

0 votes

0 answers

45 views

An injection from $\mathcal{P} (\mathbb{Z^{+})}$ to $\mathcal{P} (\mathbb{ N \times N)}$

asked Dec 14, 2022 at 17:23

0 votes

0 answers

25 views

Understanding base cases of inductive proofs in algorithm analysis Cormen et al

asked Feb 27 at 14:02

0 votes

1 answer

40 views

For any sentence $\phi$ of first-order logic, the only sentence which is an initial segment of $\phi$ is $\phi$ itself.

asked Nov 17, 2022 at 23:02

0 votes

1 answer

28 views

Confusion about the import of the standard error

asked Dec 7, 2022 at 11:12

0 votes

1 answer

105 views

How to enforce symmetry in a combination problem?

asked Oct 31, 2022 at 10:45

0 votes

1 answer

42 views

Probability that a sample of sweets is rejected

asked Oct 31, 2022 at 19:18

0 votes

0 answers

26 views

For any sentence $A$, the only sentence which is an initial segment of $A$ is $A$ itself

asked Nov 1, 2022 at 18:27

0 votes

1 answer

52 views

Explicit Substitution in Peano Arithmetic proofs.

asked Nov 16, 2022 at 11:47

0 votes

0 answers

36 views

Proof of $\forall y(Sx + y = S(x + y))$ in Peano Arithmetic.

asked Nov 17, 2022 at 11:24

0 votes

1 answer

94 views

Is my axiomatic proof of $\phi \vdash \neg \neg \phi$ correct?

asked Nov 4, 2022 at 11:53

0 votes

0 answers

38 views

I don't trust my proof of $ \neg ( \phi \rightarrow \neg \psi) \vdash \phi$

asked Nov 7, 2022 at 14:38

0 votes

0 answers

89 views

Why can we treat the numerator as a constant in partial fractions?

asked May 26, 2022 at 10:29

0 votes

0 answers

24 views

How do I show a non-geometric and non-arithmetic series converges? [duplicate]

asked Jun 16, 2022 at 10:28

0 votes

3 answers

580 views

Why is the conditional probability formula not the intersection of A and B over A, rather than the intersection over P(A)?

asked Jun 23, 2022 at 15:27

0 votes

0 answers

49 views

Why are all fields vector spaces over themselves?

asked Jul 29, 2022 at 10:27

0 votes

0 answers

50 views

Let R be a relation and A and B sets. Suppose A is a subset of B. If A is not empty, and R is transitive on A, must it also be transitive on B?

asked Sep 7, 2022 at 18:26

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27 Questions

What is the relation between the high school definition of a vector and the abstract algebra definition?

What is the difference, geometrically, between row vectors and column vectors?

Confusion on the definition of the inverse function

What is the intuition behind the probability intersection formula?

Axiomatic derivation of conditional from biconditional

Proof in Peano Arithmetic

How to formulate an induction principle for the set of all integers?

How to think about changes to the median

Simple proof of $\phi \rightarrow \neg \neg \phi$

If there is an surjection $f : \Bbb{Z}^+ \to a$, then there is an injection $f : a \to \Bbb{Z}^+$ [duplicate]

Does my proof that the recurrence $T(n) = T(\frac{n}{2}) + d = \Theta(lgn)$work?

An injection from $\mathcal{P} (\mathbb{Z^{+})}$ to $\mathcal{P} (\mathbb{ N \times N)}$

Understanding base cases of inductive proofs in algorithm analysis Cormen et al

For any sentence $\phi$ of first-order logic, the only sentence which is an initial segment of $\phi$ is $\phi$ itself.

Confusion about the import of the standard error

How to enforce symmetry in a combination problem?

Probability that a sample of sweets is rejected

For any sentence $A$, the only sentence which is an initial segment of $A$ is $A$ itself

Explicit Substitution in Peano Arithmetic proofs.

Proof of $\forall y(Sx + y = S(x + y))$ in Peano Arithmetic.

Is my axiomatic proof of $\phi \vdash \neg \neg \phi$ correct?

I don't trust my proof of $ \neg ( \phi \rightarrow \neg \psi) \vdash \phi$

Why can we treat the numerator as a constant in partial fractions?

How do I show a non-geometric and non-arithmetic series converges? [duplicate]

Why is the conditional probability formula not the intersection of A and B over A, rather than the intersection over P(A)?

Why are all fields vector spaces over themselves?

Let R be a relation and A and B sets. Suppose A is a subset of B. If A is not empty, and R is transitive on A, must it also be transitive on B?