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Zaz

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notation

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23 Questions

Votes Activity Newest Views
3
7
votes
2
answers
3k
views

When do permutations commute?

abstract-algebra permutations
Nov 12 at 20:29 Changming Sun 101
3
7
votes
2
answers
2k
views

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

notation partial-derivative
Feb 26 '19 at 0:45 user541686 11.2k
3
5
votes
4
answers
20k
views

How much faster is the Trachtenberg system?

arithmetic
Aug 2 '19 at 14:20 Ray Penber 113
1
5
votes
1
answer
154
views

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

trigonometry mental-arithmetic
Nov 17 '18 at 16:33 Zaz 996
 
4
votes
5
answers
3k
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
1
3
votes
2
answers
5k
views

Calculate area of triangle in space given points

vectors area
Oct 9 '19 at 15:00 Community♦ 1
 
3
votes
1
answer
104
views

Is this a correct way to prove by induction?

proof-verification induction
Sep 29 '17 at 20:59 Stu 1,620
 
3
votes
1
answer
101
views

Is writing equalities within an equation abuse of notation?

notation boolean-algebra
Sep 15 '17 at 18:01 Epiousios 2,840
3
3
votes
3
answers
184
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 45.2k
1
3
votes
1
answer
4k
views

How can I see alternative trigonometry solutions on a calculator?

trigonometry calculator
Jun 8 '11 at 12:01 Zaz 996
2
2
votes
1
answer
4k
views

Using the Uniform Distribution of Deaths assumption

actuarial-science
Aug 14 '18 at 3:01 Community♦ 1
 
2
votes
2
answers
235
views

Prove a map X → X must be bijective

proof-writing permutations
Sep 11 '17 at 14:55 miracle173 8,651
1
1
vote
2
answers
83
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 Community♦ 1
 
1
vote
1
answer
28
views

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

permutations
Sep 16 '17 at 17:00 kimchi lover 20.8k
 
1
vote
1
answer
64
views

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

ordinary-differential-equations
Jul 9 '17 at 0:30 Community♦ 1
 
1
vote
2
answers
65
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 996
 
0
votes
1
answer
1k
views

Calculating error on slope of graph

statistics regression data-analysis linear-regression slope
Oct 21 at 7:01 Community♦ 1
 
0
votes
1
answer
123
views

Formula for CDF of investment returns

probability probability-distributions finance
Apr 6 '19 at 18:41 Zaz 996
 
0
votes
1
answer
95
views

Is this a standard way to prove by induction?

proof-writing induction
Sep 29 '17 at 22:46 BDN 512
 
0
votes
2
answers
139
views

Locally constant function vs step function

functions
Aug 18 '16 at 7:35 Zaz 996
 
0
votes
1
answer
117
views

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

calculus
Oct 24 '15 at 20:12 Emilio Novati 57.8k
 
-3
votes
4
answers
126
views

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

sequences-and-series
Mar 5 '16 at 21:33 Mark Viola 155k
2
-3
votes
1
answer
134
views

How to approach this integration problem? [closed]

calculus integration
Feb 16 '16 at 22:26 3SAT 7,342
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