Seoul Inside
B. Sun | Seoul Inside, J.S. Von | Seoul InsideSeoul’s real estate, and deep dives into science — in English.
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 327 | Founded | 6 months ago | Last Issue | 8 days ago |
| Active | |||||
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seoulinside.substack.comLatest Issues
Complex Functions, Made Easy to Follow [Part 0-3] — Trigonometry with Just e^(ix)
TL;DR
Trigonometry is just e^(ix) seen from two sides. Take the point e^(ix) on the unit circle and its mirror image e^(−ix): average them and you get the horizontal coordinate (cos); subtract them and you get the vertical one (sin).
cos...
Complex Functions, Made Easy to Follow [Part 0-2]
We Observed It. But Why? — A 300-Year Journey of Proof
0. The Question and the Ground Rules
In Part 1, we confirmed that e^(it) comes out of the calculator as (cos t, sin t).
e^(it) = cos t + i·sin t
Now it is time to ask “why...
Seoul Housing Prices and M2 Money Supply by Administration (2003–2026)
As of October 23, 2026 · Sources: KB Kookmin Bank, Korea Real Estate Board, Bank of Korea
Summary
Across the administrations since 2003, Seoul’s average annual rate of housing price increase ranks highest under the Lee Jae-myung admini...
Complex Functions, Made Easy to Follow [Part 0-1]
0. Previously, and Today’s Game
In Part 0, we typed e^(it) into a calculator and plotted the resulting complex numbers as points on a plane. There were 41 points, for t = 0, 0.25, 0.50, …, 10, and they circled the center counter...
The M2 Archive [Part 2.5]
Chapter 1. The Definition Map: Where Does M2 End?
For First-Time Readers: What Is M2, and Why Do the Numbers Wobble?
0.1 “Money” Is Not One Thing
The 50,000-won note in your wallet is certainly money. The ba...
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