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Angel's user avatar
Angel's user avatar
Angel
  • Member for 10 years, 5 months
  • Last seen more than 1 year ago
8 votes

Substituting a real variable for a complex variable (integration by substitution)

8 votes

(Disagreement among reputable users) Indefinite integral vs. Definite integral vs. Anti-derivative

6 votes

What is the general solution of $\frac{df(x)}{dx} = f(x-a)$?

5 votes
Accepted

Number of points in line segment

4 votes
Accepted

$\int_K |x|^m |y|^n dx dy$

4 votes

Integral $\int_0^{\pi/3}\frac{x}{\cos(x)}\,dx$

4 votes

Why do we require $a\neq0$ in $\int{e^{ax}dx=\frac{1}{a}e^{ax}} + C$?

4 votes
Accepted

How is the square of $\operatorname{sgn}(x)$ defined?

4 votes
Accepted

Is Euler's identity really that beautiful or is it notationally contrived to be beautiful?

3 votes
Accepted

Unconventional hypercomplex numbers

3 votes
Accepted

General Rule for Differentiation of Tetrations

3 votes

Integral of cosine of complex exponential

3 votes
Accepted

Is this piecewise function a valid function?

3 votes

Unable to solve the following question

3 votes
Accepted

Calculating $\frac{\mathrm{d}}{\mathrm{d}x} \int_{0}^{x} e^{(kt)} f(t) \,\mathrm{d}t $

3 votes
Accepted

Question about the limit $\displaystyle\lim_{n\rightarrow \infty}\sqrt[n]{3^n+ 2^n}$

3 votes
Accepted

A method of the limit of quotient

3 votes
Accepted

Expanding the square of the absolute value of two vectors

3 votes

Can't find particular integral of a differential equation

3 votes

Defining summations in ZFC

3 votes
Accepted

why is $i^2=-1$?

3 votes

$\int_{-\infty}^\infty f(x)dx$ vs. $\lim_{b\rightarrow\infty}\int_{-b}^b f(x)dx$ for odd $f(x)$.

2 votes

Integral of a circle to find pi

2 votes

Solving first-order differential equation by exact method

2 votes

For an epsilon delta proof of a limit where a min is required, why do we choose delta to be less than or equal to one?

2 votes
Accepted

Why can't we write integrals in a way analogous to sums, without adding a differential form : $\int_{x=a}^b f(x)$ instead of $\int_a^b f(x)dx$?

2 votes
Accepted

Prove that the derivative of sine is cosine

2 votes

How do you read the summa symbol with no superscript and the Real numbers subscript?

2 votes

What does the notation for a line integral of a vector field actually mean?

2 votes
Accepted

Example of a function $\varphi: \mathrm{C} \to \mathrm{C}$ such that $\varphi(z + w) = \varphi(z) + \varphi(w)$ but $\varphi$ is not homogeneous

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