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Aug
28
comment How to write a non-homogeneous equation in self-adjoint form
This might be helpful: math.stackexchange.com/a/292386/52893
Aug
27
awarded  Notable Question
Aug
24
comment Why the limit of $\frac{\sin(x)}{x}$ as $x$ approaches 0 is 1?
The big triangle is a right triangle, and $\tan\theta={\text{opposite}\over \text{adjacent}}$, but the adjacent side is already 1, making the length of that vertical side $\tan\theta$, which he writes as $\sin\theta\over \cos\theta$.
Aug
24
comment Why the limit of $\frac{\sin(x)}{x}$ as $x$ approaches 0 is 1?
youtube.com/watch?v=o6S6RbfhRTU
Aug
24
answered How to plot a phase portrait for this system of differential equations?
Aug
14
comment Plotting parametric form of a gradient
Are you asking how to plot, say, time dependent vector fields in $\mathbb{R}^2$?
Jun
22
revised Diferential equation solution satisfying $y(0) = \pi$
edited tags
Jun
22
comment Diferential equation solution satisfying $y(0) = \pi$
You've found such a solution. So you're done.
Jun
20
comment 2D Heat Equation with special initial condition
Maybe the title too (for future users)?
Jun
20
comment 2D Heat Equation with special initial condition
Just FYI, that's an initial condition, not a boundary condition.
Jun
20
answered Square Integrable and Continuous
Jun
15
comment Geometrically, what is the span of vectors?
The point remains: for example, if $v_1,v_2\in V$, then $\text{span}\{v_1,v_2\}$ is not necessarily a basis for $V$. Simply take $V=\mathbb{R}^2$, $v_1=e_1$, $v_2=2e_1$. Your first and second sentences contradict one another.
Jun
15
comment Geometrically, what is the span of vectors?
The span of a set of vectors does not necessarily form a basis for the space (since the original vectors are not necessarily linearly independent).
Jun
13
revised Solving analitically this simple ODE
added 13 characters in body
Jun
13
comment Solving analitically this simple ODE
Yes, sorry I just didn't type the parentheses (but meant to). Fixed now.
Jun
12
answered Solving analitically this simple ODE
Jun
12
comment Solving analitically this simple ODE
Just use an integrating factor.
May
14
revised ODE Laplace Transform an impulse bring oscillating system to rest
added 180 characters in body
May
14
revised ODE Laplace Transform an impulse bring oscillating system to rest
edited tags
May
14
awarded  Revival