Equivalent eXchange

Every Fourth Thing

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Bushido

Bushido was a moral code followed by the Samurai class that arose during the Edo period of Japan. The origins of this ethos are generally agreed to be a syncretism arising from various religious an…

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The Square of Opposition, V2

Further Reading: V1, from back a ways: The Square of Opposition A database of Aristotelian and logic diagrams including many recent ones: Thanks for the nudge to do this V2 :

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Jurgen Habermas

Further Reading: Thanks for the inspiration: This image [*2.41, *3.25, *3.26, *3.27, *5.54]

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(via The Alethiometer)

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The Yoneda Lemma

I’ve been wanting to post about the Yoneda Lemma of Category Theory for a while, and finally decided how to draw my little diagram. Next, I will sketch out the fundamentals of the lemm…

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The Doomsday Clock

On the Doomsday Clock, it is 85 seconds before midnight! Tick… tick… tick… tick… Further reading: Home page for the Bulletin of the Atomic Scientists: 2026 Doomsday Clock Announcement: Complete Liv…

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Puella Magi Madoka Magica

The fourth Puella Magi Madoka Magica movie, titled “Puella Magi Madoka Magica the Movie: Walpurgisnacht: Rising” (or “Walpurgis no Kaiten”), is set for release in February 2…

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A View of the Japanese Notion of Ikigai

Some say the Japanese notion of Ikigai (生き甲斐, literally “a reason for being”) can be divided into the following four overlapping aspects: Passion (情熱, jōnetsu) Mission (目的, mokuteki) Ta…

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Four Things to Avoid for Heijoshin

The four states of mind to avoid to maintain Heijoshin (平常心), or “calm, steady mind,” are called the Shikai (四戒), or “four sicknesses of the mind”. These are derived from Ja…

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Matter and Memory, Moment and Measure

The more of these moments memory can contract into one, the firmer is the hold which it gives to us on matter : so that the memory of a living being appears indeed to measure, above all, its powers…

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Aristotle’s Fourfold Division of Being

Aristotle’s fourfold division of being, found in his work Categories, classifies entities based on whether they are “Said of” a subject and whether they are “Present in&#822…

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The pattern called the QR code is now ubiquitous. One can easily(?) generate one that points to a specific web page or site. For example, I’ve generated one for this particular page, so it&#8…

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Plato’s Fourfold Vision in the Phaedrus

In Plato’s Phaedrus, this “fourfold vision” refers to four distinct types of divine madness or inspiration; and being of divine origination are associated with various Greek gods.…

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Plato’s Fourfold Division in the Philebus

In Plato’s dialogue the Philebus, Socrates uses a fourfold division to describe fundamental, metaphysical principles of all things: the Unlimited (ápeiron, the indefinite, boundless aspect), …

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The Four Evangelists

Matt(hew) Mark Luke John Further Reading: Essay on the Four Evangelists written by Claude.AI:

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Don’t Be Square!

Being square can mean being either good or bad, depending on the context. For the good aspect, square can mean being aligned correctly or being even or balanced in some measure. For the bad aspect,…

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The Golden Touch

Not everything that is golden is to be desired. Sometimes gold can represent greed or excess in itself, the corruption that wealth and power can bring. Gold has long been coveted by those of status…