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### Questions (416)

 30 Strategies and Tips: What to do when stuck on math? 23 How to Garner Mathematical Intuition 17 How can I correct my wrong Intuition that $\forall \, x \, \in \,\emptyset : P(x) \quad$ is false? 13 If every convergent subsequence converges to $a$, then so does the original bounded sequence (Abbott p 58 q2.5.4 and q2.5.3b) 13 Intuition for cross product of vector with itself and vector with zero vector

### Reputation (1)

 +10 Recursive formula for the probability that the starting player wins [DBertsekas & JTsitsiklis P57, 1.21] +10 Without Truth Tables, how can you intuit that $P \implies Q \; \equiv \; \lnot P \vee Q$, and $\not \equiv \; P \vee \lnot Q$? +10 Do the real numbers and the complex numbers have the same cardinality? +10 If every convergent subsequence converges to $a$, then so does the original bounded sequence (Abbott p 58 q2.5.4 and q2.5.3b)

 27 How can I prove $\sup(A+B)=\sup A+\sup B$ if $A+B=\{a+b\mid a\in A, b\in B\}$ 17 Math and mental fatigue 15 How to define a bijection between $(0,1)$ and $(0,1]$? 13 Union of two vector subspaces not a subspace? 6 Is there any difference between mapping and function?

### Tags (129)

 45 real-analysis × 69 23 elementary-set-theory × 32 32 sumset × 2 22 linear-algebra × 106 32 supremum-and-infimum × 2 21 group-theory × 95 29 soft-question × 21 19 functions × 21 24 calculus × 23 17 advice × 6

### Bookmarks (382)

 1404 Visually stunning math concepts which are easy to explain 1155 Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio? 453 Best Sets of Lecture Notes and Articles 409 On “familiarity” (or How to avoid “going down the Math Rabbit Hole”?) 350 'Obvious' theorems that are actually false