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John Rector

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Tag: mathematics

Dark green cover with the title You Only Feel the Real Part beside a phasor clock: green arms labeled x, a, s, p on a glowing real axis marked FELT, pink arms labeled v, j, c on a dashed imaginary axis marked GHOST
Cat Links education

You Only Feel the Real Part

Posted on August 20, 2026August 20, 2026 jsrector

Position, velocity, acceleration, jerk, snap, crackle, pop. Your body reads exactly half that ladder — the real half. A Tegmark-style lesson for philosophy majors: you cannot feel the Earth’s thousand miles an hour because velocity is imaginary. The mathematics is not the description. It is the situation. … Continue readingYou Only Feel the Real Part

Warm paper cover with the title e Is Where You Land If You Don't Turn beside a staircase of shrinking orange arrows stepping down to a number line, landing on a gold dashed marker labeled e
Cat Links education

e Is Where You Land If You Don’t Turn

Posted on August 19, 2026August 20, 2026 jsrector

Students meet e twice — at the bank and as its own derivative. Here is a third story: run the circle lesson’s engine without the turn, and e is where the walk lands — and the exchange rate for how many steps any walk needs. … Continue readinge Is Where You Land If You Don’t Turn

Dark cover with the title How Straight Lines Make a Circle beside a chain of perpendicular neon line segments spiraling onto a dashed circle, with a pink dot marking the tip
Cat Links education

How Straight Lines Make a Circle

Posted on August 19, 2026August 20, 2026 jsrector

Every term of the Taylor series of e^iθ is the previous term turned 90° and shrunk. Chain those perpendicular steps and a circle appears — an interactive lesson that builds rotation without assuming the unit circle. … Continue readingHow Straight Lines Make a Circle

Dark slate cover reading What Is a Logarithm, with the subtitle the bridge between a world that multiplies and a mind that adds, and the identity log of a times b equals log a plus log b.
Cat Links education, Homework, How-To, Reality Equation

What Is a Logarithm

Posted on August 5, 2026 jsrector

A logarithm is the bridge between a world that multiplies and a mind that adds. Once you see that, my equation for felt experience stops being a modelling choice and becomes the only option available. … Continue readingWhat Is a Logarithm

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