user4894's user avatar
user4894's user avatar
user4894's user avatar
user4894
  • Member for 9 years, 9 months
  • Last seen this week
57 votes

Different sizes of infinity

30 votes

Difference between sum and direct sum

14 votes
Accepted

Can the complex numbers be realized as a quotient ring?

14 votes

Evaluating the reception of (epsilon, delta) definitions

13 votes

In calculus, which questions can the naive ask that the learned cannot answer?

12 votes

Can we always use the language of set theory to talk about functions?

11 votes

what is sine of a real number

9 votes

Prove that the limit of a real sequence (if it exists) can't be a complex number

8 votes

In plain language, what's the difference between two things that are 'equivalent', 'equal', and 'identical'?

7 votes
Accepted

limit point of the set of integers

4 votes

How different are the positive and negative numbers?

4 votes
Accepted

The confusingly indistinguishable nature of a function from its image

3 votes

Can someone help me have a deeper understanding of "$i$"?

3 votes

Axiom of choice - Equivalence relation - Representatives

3 votes
Accepted

I have the following English sentence that I need to convert into a sentence of predicate logic

3 votes

Flipping sign of $i$s

3 votes

Value in retracing mathematicians' steps (specifically Galois)?

2 votes
Accepted

Prove that if a $\in \mathbb{Z}$ then $a^{3} \equiv a(mod 3)$

2 votes

Question about Cartesian products at the elementary level

2 votes

Why does dividing by zero give us no answer whatsoever?

2 votes

Is there a difference between the calculated value of Pi and the measured value?

2 votes

Explain complex numbers

2 votes
Accepted

Is it possible to add vectors that don't have the same initial point or terminal point?

2 votes
Accepted

Explanation of conditions when this map is open

2 votes

Where can I find the history of mathematical symbols in the order they were introduced?

2 votes

The Intuition of the Construction of a Non-Measurable Set (Vitali Set) on the Real Line

2 votes

Quotient group $G = \mathbb Q/\mathbb Z$

1 vote

Cartesian products and power sets

1 vote

Analysis continuity proof question

1 vote
Accepted

Question about proving infinite union of sequence of countable sets is countable.