A functional equation from my favorite book.

A nice functional equation from Romania

a nice functional equation.

The Oldest Unsolved Problem in Math

the most outlandish technique is used to solve this...

A delightfully symmetric expression.

How Imaginary Numbers Were Invented

an absolutely surprising final solution to this functional equation.

Power Series 4

Solving Log Equations II

a notorious functional equation.

A functional equation from Kyrgyzstan

How to Speak

The Discovery That Transformed Pi

Wave Equation (D'alembert's Formula)

what a great "double" functional equation!

One of the coolest functional equations I have seen!

The Sound of Inner Peace 7 | Relaxing Music for Meditation, Yoga, Stress Relief, Zen & Deep Sleep

f bounded, integrable implies f^2 is integrable on [a,b] (Proof Sketch)

Gentle music, calms the nervous system and pleases the soul - healing music for the heart and blood

a fun functional equation with an inverse twist