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43 Questions

Views Newest Activity Votes

votes

answers

views

Fit a equilateral triangle on three arbitrary parallel lines with an edge and compass

euclidean-geometry

Oct 22 at 15:03 Ray McKaig 1

votes

answers

12k

views

Prove concurrency of triangle altitudes with vector algebra?

linear-algebra geometry

Jan 4 '16 at 14:33 Harish Chandra Rajpoot 30.6k

votes

answers

495

views

Expectation of joint life span

probability

Dec 24 '12 at 17:42 qed 961

votes

answer

259

views

Equivalence of another formula for the number of $r$-combinations with repetition allowed

combinatorics

Mar 2 '15 at 9:53 Alijah Ahmed 10.3k

votes

answers

views

A general formula for $\sum (k-1)(k-2)(k-3)$?

sequences-and-series algebra-precalculus

Oct 22 '11 at 14:22 Community♦ 1

votes

answers

views

Rigorously prove that the tangent line is indeed tangent?

calculus derivatives

Apr 28 '14 at 0:40 Ben Crowell 6,938

votes

answers

views

Spatially invariant systems

signal-processing

Oct 10 at 8:47 fishermanymc 11

votes

answers

615

views

Continuity at a point implies continuity on an interval?

calculus

Dec 4 '12 at 22:13 user127.0.0.1 6,439

votes

answer

views

How is the Erlang pdf derived?

probability

Oct 12 at 17:01 Community♦ 1

votes

answers

119

views

Books on n-dimensional euclidian geometry?

geometry reference-request soft-question

Dec 10 '12 at 15:38 apnorton 16.4k

votes

answer

117

views

Is there a geometric concept describing this?

geometry

Dec 4 '12 at 16:53 qed 961

votes

answers

views

A vector with fixed correlation with existing vector, is it always possible?

correlation

Jul 31 '15 at 15:59 Daniel Fischer♦ 179k

votes

answer

views

Describing a third variable with two other variables, using combination of elementary functions.

functions

May 23 '14 at 17:43 Daniel R 2,982

votes

answers

views

Orthonormal basis, decompse then add back

linear-algebra orthonormal

May 5 '14 at 20:36 Teddy Frei 439

votes

answers

717

views

Limit of this power function when the base tends to infinity

limits

Dec 8 '13 at 14:27 alexjo 13k

votes

answer

679

views

Is the Cartesian product of an infinite number of $\mathbb{Z}^+$ countable?

elementary-set-theory

Oct 8 '13 at 18:43 user2566092 24.4k

votes

answer

112

views

An integral similar to binomial formula?

calculus

Dec 18 '12 at 21:43 Argon 22.2k

vote

answer

334

views

Product in category theory

category-theory

Dec 26 '16 at 23:12 Community♦ 1

vote

answers

402

views

Functor over sets of functions

category-theory

Dec 26 '16 at 22:57 Alex Mathers 13.4k

vote

answers

109

views

Do $f_{xx}$ and $f_{yy}$ always have the same sign?

calculus

Aug 8 '16 at 14:45 qed 961

vote

answers

views

Function defined on a closed interval must be bounded?

real-analysis

Aug 31 '15 at 16:57 Euler88 ... 2,018

vote

answer

399

views

Get number of vertices when number of internal vertices is known ofr a full binary tree

trees

Mar 2 '15 at 0:53 coffeemath 28.1k

vote

answers

views

Are the definitions of convolution here contradict each other?

convolution

Mar 3 '14 at 12:44 qed 961

vote

answer

views

Linear regression: b1 has the minimum variance among all unbiased linear estimators of beta1

regression

Feb 11 '13 at 18:51 Michael Hardy 227k

vote

answer

views

Probability of a label appearing on a frazzle

probability

Dec 16 '12 at 15:13 Ragib Zaman 29.8k

vote

answer

102

views

An integral with limits being a funtion of a parameter.

calculus

Dec 15 '12 at 19:46 icurays1 14.4k

vote

answer

255

views

Probability of $\lambda$ given k, in Poisson distribution.

probability

Dec 9 '12 at 20:32 ctype.h 691

vote

answers

149

views

Infinite number of primes in the sequence $1+t^2$? [duplicate]

prime-numbers

Sep 14 '11 at 13:22 Community♦ 1

votes

answer

views

Trigonometric equality involving $a\sin \alpha + b \sin \beta$

trigonometry

Jan 1 '17 at 10:33 lab bhattacharjee 244k

votes

answer

874

views

Combination with limited repetition

combinatorics

Mar 24 '16 at 15:14 JMoravitz 58.1k

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43 Questions

Fit a equilateral triangle on three arbitrary parallel lines with an edge and compass

Prove concurrency of triangle altitudes with vector algebra?

Expectation of joint life span

Equivalence of another formula for the number of $r$-combinations with repetition allowed

A general formula for $\sum (k-1)(k-2)(k-3)$?

Rigorously prove that the tangent line is indeed tangent?

Spatially invariant systems

Continuity at a point implies continuity on an interval?

How is the Erlang pdf derived?

Books on n-dimensional euclidian geometry?

Is there a geometric concept describing this?

A vector with fixed correlation with existing vector, is it always possible?

Describing a third variable with two other variables, using combination of elementary functions.

Orthonormal basis, decompse then add back

Limit of this power function when the base tends to infinity

Is the Cartesian product of an infinite number of $\mathbb{Z}^+$ countable?

An integral similar to binomial formula?

Product in category theory

Functor over sets of functions

Do $f_{xx}$ and $f_{yy}$ always have the same sign?

Function defined on a closed interval must be bounded?

Get number of vertices when number of internal vertices is known ofr a full binary tree

Are the definitions of convolution here contradict each other?

Linear regression: b1 has the minimum variance among all unbiased linear estimators of beta1

Probability of a label appearing on a frazzle

An integral with limits being a funtion of a parameter.

Probability of $\lambda$ given k, in Poisson distribution.

Infinite number of primes in the sequence $1+t^2$? [duplicate]

Trigonometric equality involving $a\sin \alpha + b \sin \beta$

Combination with limited repetition