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Sergio
  • Member for 5 years, 4 months
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  • ℝ^3
6 votes
3 answers
2k views

Difference between a number and a set with one number

5 votes
4 answers
1k views

Why doesn't the multiplication rule work here?

4 votes
1 answer
293 views

Are null sets the only ones that are disjoint but not distinct?

3 votes
7 answers
454 views

Is $i$ a positive number?

3 votes
0 answers
40 views

How do people know that their experiment follows a gamma distribution?

3 votes
2 answers
168 views

How can we know when the limit given result is wrong if we are trying to prove it by its definition?

3 votes
1 answer
157 views

What does a bar of two variables mean in linear regression?

2 votes
3 answers
111 views

how show that $b$ is the supremum of an interval $[a,b)$

2 votes
0 answers
72 views

Showing that the set is non-empty and bounded above

2 votes
1 answer
96 views

What is the infimum of $\left\{\frac{1}{2^x},x\in\mathbb{N}\right\}$? Prove it.

2 votes
1 answer
180 views

Different approaches of find $P(X+Y>1/2)$ yielding different results

2 votes
0 answers
82 views

Is there any Mathematical explanation why derivatives are way easier than integrals? [duplicate]

2 votes
2 answers
54 views

What's the use of having both a proper subset and subset definition when we have the of notion equality?

2 votes
1 answer
539 views

Difference between binomial and hypergeometric distributions

2 votes
1 answer
1k views

Different approaches of binomial approximation using normal distribution yielding different results

2 votes
3 answers
201 views

Finding number of pivots when matrix includes variables

2 votes
4 answers
7k views

Why does a determinant of $0$ mean the matrix isn't invertible?

2 votes
1 answer
808 views

Is the or statement always inclusive in Mathematics? [duplicate]

1 vote
2 answers
2k views

Difference between $1-P(A)$ and $P(A')$ in probability

1 vote
1 answer
266 views

Differentiating between the union and intersection of probabilities

1 vote
2 answers
298 views

Show that $S$ is subset of f$^{-1}(f(S))$ [duplicate]

1 vote
1 answer
97 views

How many $5$-letter words can we form starting with b and containing c and having $2$ vowels and $3$ consonants?

1 vote
1 answer
136 views

How can a non-constant function over the p-adic numbers have a derviative of zero?

1 vote
1 answer
162 views

If A is a non-proper subset of B, can we deduct A=B?

1 vote
2 answers
61 views

Is it enough if $g$ is injective for $g ◦ f$ to be injective?

1 vote
1 answer
2k views

Applying the central limit while having the sample standard deviation

1 vote
0 answers
102 views

What do you do in order not to forget what you have learned some time ago?

1 vote
2 answers
389 views

How does one improve their exam performance and avoid "stupid/careless" mistakes? [closed]

1 vote
1 answer
34 views

We have $Y=aX-bX+b$ with $b>a$, find $\rho_{xy}$

1 vote
1 answer
19 views

Finding $P(Z<K)$ if we have $P(X>8)+P(X>42)=1$ and $P(X<11)=0.0401$