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Measure theory 1.4.1: fix Exercise number for null algebra not atomic#557

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Chessing234:fix/measure-1-4-1-null-algebra-exercise-number
Jul 3, 2026
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Measure theory 1.4.1: fix Exercise number for null algebra not atomic#557
teorth merged 1 commit into
teorth:mainfrom
Chessing234:fix/measure-1-4-1-null-algebra-exercise-number

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The "null algebra is not atomic" result is docstring-labeled Exercise 1.4.6, but in the book this is part of Exercise 1.4.5 ("Show that the elementary, Jordan, Lebesgue, and null algebras are not atomic algebras"). The three sibling results above it (elementary_boolean_algebra_not_atomic, JordanMeasurable.boolean_algebra_not_atomic, LebesgueMeasurable.boolean_algebra_not_atomic) are all correctly labeled Exercise 1.4.5; the null case was the odd one out.

Exercise 1.4.6 is a separate exercise (Intersection of algebras), which is already correctly labeled on the following declaration.

Docstring-only change.

Made with Cursor

…1.4.5)

Co-authored-by: Cursor <cursoragent@cursor.com>
@teorth teorth merged commit b3c8e51 into teorth:main Jul 3, 2026
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