Question

Value of cos 1 (angle is in radians)?

score 15.7k · Answer 1 · 2026-03-25 06:03:17

15.7k

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Value of cos 1 (angle is in radians)?

Published on 25 Mar 2026 - 6:03

score 287 · Answer 2 · 2026-03-25 20:12:42

287

Views

Is $9$ the limit of $\frac{987654321}{123456789}, \frac{998877665544332211}{112233445566778899}\ldots$

Published on 25 Mar 2026 - 20:12

score 749 · Answer 3 · 2019-07-29 18:03:36

749

Views

In the proof of irrationality of $\sqrt{2}$ or $\sqrt{7}$, why do the numerator and denominator of a rational number have to be in their lowest term?

Published on 29 Jul 2019 - 18:03

score 312 · Answer 4 · 2019-08-05 03:13:56

312

Views

Limit approaching 0 of a rational defined function

Published on 05 Aug 2019 - 3:13

score 785 · Answer 5 · 2026-03-26 17:51:52

785

Views

Enumerate rational numbers in ascending order

Published on 26 Mar 2026 - 17:51

score 216 · Answer 6 · 2019-08-07 10:28:53

216

Views

Can $\frac{1}{2a}\left(-b+\sqrt{b^2-4ac}\right)$ be rational if $a=3n_1$, $b=-3n_1^2$, $c=n_1^3-n_2^3$, for positive rational $n_i$ with $n_1<n_2$?

Published on 07 Aug 2019 - 10:28

score 261 · Answer 7 · 2026-02-23 04:41:54

261

Views

Can the Average of an Infinite Number of Rational Numbers be Irrational?

Published on 23 Feb 2026 - 4:41

score 455 · Answer 8 · 2026-03-27 07:49:55

455

Views

Orbits of vectors under the action of $\mathrm{GL}_n(\mathbb Q)$

Published on 27 Mar 2026 - 7:49

score 378 · Answer 9 · 2026-03-26 19:00:45

378

Views

Intuition for non-convergence of Cauchy sequence in $\mathbb{Q}$

Published on 26 Mar 2026 - 19:00

score 332 · Answer 10 · 2019-08-13 08:26:26

332

Views

Is the additive rational group $\mathbb{Q},+$ generated by $\frac{1}{p}$ where p is a prime?

Published on 13 Aug 2019 - 8:26

score 48 · Answer 11 · 2019-08-13 19:35:07

48

Views

Can a power series with rational cffs. that sum to irrational lim evaluate to rational lim at non-zero rational point?

Published on 13 Aug 2019 - 19:35

score 449 · Answer 12 · 2019-08-14 03:34:36

449

Views

Collection of intervals covers $[0,1]$?

Published on 14 Aug 2019 - 3:34

score 770 · Answer 13 · 2019-08-15 11:41:30

770

Views

Rational topological basis for Euclidean topology - topology without tears 2.2.3

Published on 15 Aug 2019 - 11:41

score 1.1k · Answer 14 · 2019-08-20 09:31:32

1.1k

Views

Is even divided by even a rational or irrational number?

Published on 20 Aug 2019 - 9:31

score 713 · Answer 15 · 2019-08-22 21:50:16

713

Views

Is $z=e^{\frac{1}{\log(x)}}$ a solution to an algebraic equation?

Published on 22 Aug 2019 - 21:50

List Question

Value of cos 1 (angle is in radians)?

Is $9$ the limit of $\frac{987654321}{123456789}, \frac{998877665544332211}{112233445566778899}\ldots$

In the proof of irrationality of $\sqrt{2}$ or $\sqrt{7}$, why do the numerator and denominator of a rational number have to be in their lowest term?

Limit approaching 0 of a rational defined function

Enumerate rational numbers in ascending order

Can $\frac{1}{2a}\left(-b+\sqrt{b^2-4ac}\right)$ be rational if $a=3n_1$, $b=-3n_1^2$, $c=n_1^3-n_2^3$, for positive rational $n_i$ with $n_1<n_2$?

Can the Average of an Infinite Number of Rational Numbers be Irrational?

Orbits of vectors under the action of $\mathrm{GL}_n(\mathbb Q)$

Intuition for non-convergence of Cauchy sequence in $\mathbb{Q}$

Is the additive rational group $\mathbb{Q},+$ generated by $\frac{1}{p}$ where p is a prime?

Can a power series with rational cffs. that sum to irrational lim evaluate to rational lim at non-zero rational point?

Collection of intervals covers $[0,1]$?

Rational topological basis for Euclidean topology - topology without tears 2.2.3

Is even divided by even a rational or irrational number?

Is $z=e^{\frac{1}{\log(x)}}$ a solution to an algebraic equation?

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