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Qi Zhu
  • Member for 4 years, 11 months
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40 votes
13 answers
8k views

Why do we care about equivalence relations?

32 votes
2 answers
2k views

Motivation for the ring product rule $(a_1, a_2, a_3) \cdot (b_1, b_2, b_3) = (a_1 \cdot b_1, a_2 \cdot b_2, a_1 \cdot b_3 + a_3 \cdot b_2)$

13 votes
5 answers
3k views

Where does one even need Bernoulli's Inequality?

12 votes
1 answer
551 views

Demystifying the Magic Diagram

11 votes
3 answers
1k views

Why Do We Only Take Norms Over Real/Complex Numbers?

9 votes
1 answer
151 views

Why are (co-)ends called "(co-)ends"?

8 votes
4 answers
276 views

Reference Request: Witt Vectors

7 votes
1 answer
298 views

Determinant of 9 Consecutive Integers

7 votes
1 answer
234 views

Intuition of Kolmogorov‘s 0-1 Law

6 votes
3 answers
948 views

The Importance of Minors

6 votes
1 answer
202 views

Prove L’Hôspital’s rule without the mean value theorem

6 votes
1 answer
485 views

Schwarz's Theorem and Discontinuous Second Derivatives

6 votes
1 answer
186 views

Intuition of Algebraic Partition of Unity

5 votes
1 answer
138 views

Examples of "Monoidal Categories" without Pentagon Axiom

5 votes
2 answers
2k views

Intuition: Dual Space is always Banach

5 votes
0 answers
60 views

Cardinality without Axiom of Choice [duplicate]

5 votes
0 answers
81 views

Demystify the Hilbert Function

5 votes
0 answers
200 views

Elementary Differential Geometry before Manifolds?

5 votes
2 answers
147 views

Completeness in Krasner's Lemma

5 votes
1 answer
145 views

Proof of separability of polynomials without derivatives

4 votes
1 answer
267 views

Motivation and references for an integral formula in measure theory

4 votes
2 answers
804 views

Intuition: Portmanteau-Theorem

4 votes
1 answer
181 views

What is interesting about the support of a module?

4 votes
1 answer
121 views

Duality Concept: Submodule and Quotient

4 votes
1 answer
67 views

Separability in the Definition of Ramification

4 votes
0 answers
64 views

Systematic Way to find System of Parameters of Local Rings

4 votes
0 answers
156 views

Intuition non-measurability of Vitali-Set

4 votes
1 answer
56 views

Interpreting the Jordan Normal Form

3 votes
0 answers
375 views

Most Pathological Object in Complex Analysis

3 votes
1 answer
414 views

Motivation - Proving Cayley-Hamilton with Adjoints