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sesodesa
  • Member for 9 years, 5 months
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5 votes
3 answers
700 views

How to rearrange a quadratic into its factorized form?

2 votes
2 answers
2k views

How to show that the upper and lower Riemann integrals of a function, say $f(x) = -2x$, are equal?

2 votes
5 answers
1k views

How would one show that the integral $\int_0^\infty \frac 1 {(1+x)\sqrt x}\,\mathrm d x$ either diverges or converges?

2 votes
1 answer
70 views

On the existence of a specific set of measures $\{ \mu(E) : E\in\mathcal S \}$, where $\mathcal S$ is a $\sigma$-algebra

2 votes
3 answers
31 views

Are the following equations concerning matrices and their eigenvectors equivalent?

2 votes
1 answer
835 views

Are regular expressions sets?

2 votes
1 answer
1k views

Showing that the language of prefixes $\operatorname{pre}\mathcal L$ is regular by using the definition of a regular language

2 votes
1 answer
190 views

A bijection between all regular expressions of alphabet $\Sigma$ and the natural numbers $\mathbb N$

2 votes
1 answer
308 views

Converting a regular expression to its complement via automata

2 votes
1 answer
51 views

Which part of the string $00011112222$ can be pumped?

2 votes
1 answer
3k views

Is a language $L$ recursive, if it and its complement $L^c$ are both recursively enumerable?

1 vote
0 answers
68 views

A multiple choice on formal languages, Turing machines and automata

1 vote
2 answers
75 views

Show that the seminorm $|\cdot|_p$ satisfies the second norm axiom, a question about $(\cdot)^p$ and $(\cdot)^{1/p}$, when $p = \infty$

1 vote
1 answer
43 views

What makes a deterministic finite automaton different from another one?

1 vote
1 answer
95 views

Keeping track of two different counters with a single stack, needed in recognizing the language $\mathcal L = \{0^m1^n \mid m \leq n \leq 2m\}$

1 vote
1 answer
83 views

Is $\mathcal L_1 \cup \mathcal L_2$ a DCFL, if and only if $\mathcal L_1 \cap \mathcal L_2$ is a DCFL?

1 vote
1 answer
55 views

Determining the lookahead set of an $\mathrm{LL}(1)$-grammar

1 vote
0 answers
35 views

Using induction to show that the languages $\mathcal L(A)$ and $\mathcal L(G(A))$ are the same

1 vote
1 answer
79 views

Using an inference in an inference

1 vote
0 answers
60 views

Inductive hypothesis of constructive induction

1 vote
0 answers
23 views

Which of these strings does the included pushdown automaton recognize based on accepting states?

1 vote
1 answer
117 views

Prove that $\sin z = 0 \Rightarrow z = n\pi, n\in\mathbb Z$. Where did I make a mistake?

1 vote
0 answers
69 views

Show that $f : \mathbb R \to \mathbb C \in 2\pi\mathrm i \mathbb Z$ when $L : \mathbb C\setminus\{0\} \to \mathbb C$ is continuous

1 vote
1 answer
27 views

A convergence proof, trouble parsing the assignment

1 vote
1 answer
67 views

How can the shape in this picture be descibed mathematically?

1 vote
2 answers
71 views

If a function $f: A \to \mathbb R$ is bounded and continuous on $A$, does its integral on said interval converge uniformly?

1 vote
1 answer
95 views

Let $A \subseteq B$ be dense in $B$. Show that the closure $\overline A = B$.

1 vote
1 answer
288 views

Showing that an integral operator on $L^2(0,1)$ is bounded

1 vote
0 answers
46 views

Show that the integers $0$, $1$ and $3$ are eigenvalues of $T : L^2[-\pi, \pi] \to L^2[-\pi, \pi]$

1 vote
0 answers
29 views

Showing the independence of a pair of events $A_n$ and $A_{n+1}$