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Apr
14
reviewed Close How to determine where a non-linear PDE is elliptic, hyperbolic, or parabolic?
Apr
13
comment Complex contour integral with sign function:$-i \int \limits_{-\infty}^\infty \frac{{\rm sgn}(x)^2 ~x~ e^{i x}}{1+ax^2} dp$
$\text{}\text{}dp$?
Apr
10
comment Method of characteristics inhomogeneous nonlinear wave equation
Studying the Burger's equation, as @user88595 suggest, will not only help you to derive the solution, but also to understand how it behaves.
Apr
10
revised Method of characteristics inhomogeneous nonlinear wave equation
added 116 characters in body
Apr
10
answered Method of characteristics inhomogeneous nonlinear wave equation
Apr
8
reviewed No Action Needed How to solve an overdetermined linear system given equations with different uncertainties
Apr
8
reviewed Close Geometrical interpretation of tan(x) > x
Apr
8
reviewed Leave Open Open quotient of second countable space is second countable
Apr
8
reviewed Reviewed show norm of self-adjoint operator is maximum of abs value of eigenvalue
Apr
8
revised show norm of self-adjoint operator is maximum of abs value of eigenvalue
texified it
Apr
8
reviewed Leave Open Determining how accurate an ellipse fit is
Apr
1
reviewed Close $f:A \backslash U\to B \backslash f(U)$ is also homeomorphic?
Apr
1
reviewed Leave Open Confidence interval 95 %, how many colorblind?
Apr
1
reviewed Leave Open Minimum area of a triangle
Apr
1
reviewed Close Finding the absolute min and max
Apr
1
reviewed Close linear differential equation problem
Mar
26
reviewed Leave Open Should I use the ratio test to determine convergence for $\sum_{k = 1}^{\infty}{1 \over k\left[1 + \ln^{2}\left(k\right)\right]}$?
Mar
4
reviewed Approve Show that $\sum\limits_{k=0}^\infty (-1)^k \frac{1}{\sqrt{k+1}}$ converges but not absolutely
Mar
4
reviewed Close Proving $1 + 1 = 2$
Mar
4
reviewed Leave Open Use a differential to estimate to estimate the given quantity.