Harmonic except at a point
47977
If $u$ is harmonic and bounded in $0 < |z| < \rho$, show that the origin is a removable singularity
140972
Uniform convergence of harmonic functions to $0$ on compact subsets
68171
Non-trigonometric Continuous Periodic Functions
97192
product of harmonic functions
118921
Beat frequency for 3 waves
1331
Approximation of the Sine function near $0$
12488
Show that $\frac{uu_x + vv_x}{u^2 + v^2}$ is harmonic.
89180
limit of reciprocal of function
155951
Harmonic series sum approximation
69931
Why does a simple pendulum or a spring-mass system show simple harmonic motion only for small amplitudes?
116776
Opposite of "infinitesimal"
29389
Why does $k/m=\omega^2$ for harmonic motion?
20945
On a series involving harmonic numbers
31672
$L^p$-norm of the gradient of a harmonic function.
64962
Ignore Pulses Less than a Given Width in a Pulse Train
111056
Harmonic conjugate of $\ln|z|$ in $\mathbb C \setminus \{0\}$
41841
Function with limits only at irrational points