Intereting Posts

Fast calculation for $\int_{0}^{\infty}\frac{\log x}{x^2+1}dx=0$
There exists an injection from $X$ to $Y$ if and only if there exists a surjection from $Y$ to $X$.
Markov property question
Find a positive integer $n$ such that $ϕ(n) = ϕ(n + 1) = ϕ(n + 2)$
Locally non-enumerable dense subsets of R
Rate of convergence of series of squared prime reciprocals
How can I prove that $\left|\sum_{i=0}^r (-1)^i \binom{a}{i} \binom{n-a}{r-i}\right| \leq \binom{n}{r}$?
How to find sum of power series $\sum_{n=0}^\infty\frac{1}{n!(n+2)}$ by differentiation and integration?
Solving the recurrence $t(n)=(t(n-1))^2 + 1$
Why do we look at morphisms?
Combinatorial expression for all ternary strings that don't have consecutive 1's and 2's
Semilinear Poisson PDE – proving a (hopefully) simple inequality
Counting the number of paths on a graph
Evaluate: $\int_0^{\pi} \ln \left( \sin \theta \right) d\theta$
How to solve the limit? $ \lim_{x \to +\infty} \frac{(\int^x_0e^{x^2}dx)^2}{\int_0^xe^{2x^2}dx}$

*This thread here about iPad is getting Android -answers that belong to other thread.*

I am interested in things such as real-time TeXing, LaTeX recognition, writing math by styluses/keyboards, teaching — anything that can be useful for mathematicians and students alike to work.

So can you use Android devices for reading textbooks and writing math by hand?

- Properties and notation of third-order (and higher) partial-derivatives
- What would qualify as a valid reason to believe there is a closed form?
- Why is the Laplacian important in Riemannian geometry?
- Path to Basics in Algebraic Geometry from HS Algebra and Calculus?
- Why there is no sign of logic symbols in mathematical texts?
- List of interesting integrals for early calculus students

- Most important Linear Algebra theorems?
- Angle brackets for tuples
- Why are groups more important than semigroups?
- What does “rigorous proof” mean?
- What are some classic fallacious proofs?
- Why is an integral domain a commutative ring with unity?
- Finding the null space of a matrix by least squares optimization?
- Organization of the Learning Process
- Does a negative number really exist?
- Can I get a PhD in Stochastic Analysis given this limited background?

Because most Android devices lack proper screens, precision writing with things such as Jot Pro do not work. Your best bet for precision writing with Android is to get a Thinkpad x220 tablet or similar. More about this here. I use Maglus stylus in Android devices because the precision tools do not work. Then I use finger-writing tools below, free and good enough to have an old Android phone for casual uses such as finding certain Greek alphabets.

**Apps with Finger-writing**

The apps below do not work with precision writing with Jot because most Android devices do not have good-enough display. Currently, the only way to test whether Jot works with a display is to test it: even certain better-than-retina-displays do not work with Jot.

I. Detexify here

II. OCR MyScript -calculator here

**Accessories**

I use Gooseneck 1/4, Balljoint 1/4 and camera-phone-mount here to have my hands free while working with things. Sometimes, I use a macro flash for near-photographs with a DSL camera for very precise photographs. Phone-camera works however for casual photos such as note-taking.

*P.s. For future, there is a software called Screenshot UX here for sharing sheetshots in Android devices but it requires rooted phone. By this tool, you can easily show and recommend apps.*

- showing the limit of a recurrence relation
- Galois Groups of Finite Extensions of Fixed Fields
- Uniformly distributed points distance question
- Question $5.9$ – Evans PDE $2$nd edition
- Isoperimetric problem in the calculus of variations
- How many solutions does $\cos x + \cos (2x) + \cos (3x) +\cos (4x) = -\frac{1}{2}$ have in $$?
- The transpose of a linear injection is surjective.
- Magical properties in “2015”?
- Prove $p_n(x) \rightarrow \sqrt{x}$ uniformly as $n \rightarrow \infty$
- How to find the third coordinate of a right triangle given 2 coordinates and lengths of each side
- Does every group whose order is a power of a prime p contain an element of order p?
- Relation between Borel–Cantelli lemmas and Kolmogorov's zero-one law
- How to prove the property of the Lemoine point of a triangle?
- Proving $x^n – y^n = (x-y)(x^{n-1} + x^{n-2} y + … + x y^{n-2} + y^{n-1})$
- De Morgan's Law – Proof of $(\cup_{i} A_{i})^c = (\cap_{i} A_{i}^c)$