Profile Activity

Zaz

Meta user

Network profile

Reputation

582

2016
2017
2018
2019

Top tag

notation

Next privilege

1,000 Rep.

Create new tags

Badges

Newest

Next badge

0/1

Impact

5 posts edited

0 helpful flags

149 votes cast

Summary Answers Questions Tags Badges Favorites Bounties Reputation All actions

24 Questions

Views Newest Activity Votes

votes

answers

views

When do permutations commute?

abstract-algebra permutations

Dec 20 at 3:27 Alexander Burstein 1,301

votes

answers

16k

views

How much faster is the Trachtenberg system?

arithmetic

Jan 11 '16 at 10:46 Community♦ 1

votes

answer

136

views

How can I mentally calculate $\cos(x), x∈(0.7, 1.2)$

trigonometry mental-arithmetic

Nov 17 at 16:33 Zaz 582

votes

answer

101

views

Is this a correct way to prove by induction?

proof-verification induction

Sep 29 '17 at 20:59 Stu 1,195

votes

answer

views

Is writing equalities within an equation abuse of notation?

notation boolean-algebra

Sep 15 '17 at 18:01 Epiousios 1,607

votes

answers

175

views

Why doesn't $\int_{-1}^{1}\frac{dx}{x} = \ln|x|\biggr\rvert_{-1}^{1} = 0$?

integration limits definite-integrals area

Feb 3 '16 at 19:51 Mhenni Benghorbal 43.5k

votes

answers

views

Work out the values of a and b from the identity $x^2 - ax + 144 = (x-b)^2$

algebra-precalculus polynomials

Apr 24 '12 at 16:40 Community♦ 1

votes

answer

views

How can I see alternative trigonometry solutions on a calculator?

trigonometry calculator

Jun 8 '11 at 12:01 Zaz 582

votes

answers

622

views

Why don't we use the partial derivative symbol for normal derivatives?

notation partial-derivative

Feb 26 at 0:45 Mehrdad 6,889

votes

answer

views

Using the Uniform Distribution of Deaths assumption

actuarial-science

Aug 14 at 3:01 Community♦ 1

votes

answers

117

views

Prove a map X → X must be bijective

proof-writing permutations

Sep 11 '17 at 14:55 miracle173 7,381

vote

answers

views

Calculate area of triangle in space given points

vectors area

Feb 8 at 9:03 Community♦ 1

vote

answers

views

Visual proof that $\mathbb Z_m × \mathbb Z_n = \mathbb Z_{mn} \iff \gcd(m,n) = 1$

visualization

Oct 20 '17 at 16:27 Thomas Andrews 132k

vote

answer

views

Are there multiple ways to translate a permutation $\alpha$ to a permutation $\beta$?

permutations

Sep 16 '17 at 17:00 kimchi lover 13.5k

vote

answer

views

Why do we always use phase lag instead of phase gain?

ordinary-differential-equations

Jul 9 '17 at 0:30 trying 4,316

vote

answers

views

Evaluating the integral $\int{\frac{x^2-2x-1}{(x-1)^2(x^2+1)}}$

integration indefinite-integrals

Jan 29 '16 at 16:02 Zaz 582

votes

answers

views

Formula for CDF of investment returns with continuous addition to principal

probability probability-distributions finance

Apr 6 at 19:06 Zaz 582

votes

answer

views

Formula for CDF of investment returns

probability probability-distributions finance

Apr 6 at 18:41 Zaz 582

votes

answer

views

Calculating error on slope of graph

statistics regression data-analysis linear-regression slope

Mar 3 at 15:48 Claude Leibovici 128k

votes

answer

views

Is this a standard way to prove by induction?

proof-writing induction

Sep 29 '17 at 22:46 BDN 542

votes

answers

104

views

Locally constant function vs step function

functions

Aug 18 '16 at 7:35 Zaz 582

votes

answer

views

“Compute $dy$ as $x$ changes from $2$ to $2.1$”?

calculus

Oct 24 '15 at 20:12 Emilio Novati 52.4k

-3

votes

answers

116

views

How to calculate $\sum_{k=1}^∞{\frac{1}{k(k+1)}}$ [duplicate]

sequences-and-series

Mar 5 '16 at 21:33 Mark Viola 135k

-4

votes

answer

124

views

How to approach this integration problem? [closed]

calculus integration

Feb 16 '16 at 22:26 3SAT 6,351

Stack Exchange Network

current community

your communities

more stack exchange communities

Next privilege

Next badge

24 Questions

When do permutations commute?

How much faster is the Trachtenberg system?

How can I mentally calculate $\cos(x), x∈(0.7, 1.2)$

Is this a correct way to prove by induction?

Is writing equalities within an equation abuse of notation?

Why doesn't $\int_{-1}^{1}\frac{dx}{x} = \ln|x|\biggr\rvert_{-1}^{1} = 0$?

Work out the values of a and b from the identity $x^2 - ax + 144 = (x-b)^2$

How can I see alternative trigonometry solutions on a calculator?

Why don't we use the partial derivative symbol for normal derivatives?

Using the Uniform Distribution of Deaths assumption

Prove a map X → X must be bijective

Calculate area of triangle in space given points

Visual proof that $\mathbb Z_m × \mathbb Z_n = \mathbb Z_{mn} \iff \gcd(m,n) = 1$

Are there multiple ways to translate a permutation $\alpha$ to a permutation $\beta$?

Why do we always use phase lag instead of phase gain?

Evaluating the integral $\int{\frac{x^2-2x-1}{(x-1)^2(x^2+1)}}$

Formula for CDF of investment returns with continuous addition to principal

Formula for CDF of investment returns

Calculating error on slope of graph

Is this a standard way to prove by induction?

Locally constant function vs step function

“Compute $dy$ as $x$ changes from $2$ to $2.1$”?

How to calculate $\sum_{k=1}^∞{\frac{1}{k(k+1)}}$ [duplicate]

How to approach this integration problem? [closed]