This site will be taken down March 31st, 2026.

This was not an easy decision to make. For the last couple years, I have been struggling to find motivation for this site and to keep up with basic maintenance and security updates. With the rise of AI and more sophisticated tools, the usefulness of sites like this is questionable and traffic has nose-dived. I just don't have it in me to keep doing this. Thank you all for 10 years of support!

Zach

四色定理

Readings

Kana: ししょくていり、よんしょくていり
Romaji: shishokuteiri, yonshokuteiri
Kana
Romaji

Definition

1

four-color theorem (colour) (theorem stating that any map can be colored such that no two adjacent segments have the same color, if only four colors are used)

Kanji

Readings: シ、 よ、 よ.つ、 よっ.つ、 よん
Meaning: four
Readings: ショク、 シキ、 いろ
Meaning: color
Readings: テイ、 ジョウ、 さだ.める、 さだ.まる、 さだ.か
Meanings: determine, fix, establish, decide
Readings: リ、 ことわり
Meanings: logic, arrangement, reason, justice, truth