Opening the book…
4.2: Resources is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by LibreTexts.
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From LibreTexts, under CC BY-NC-SA, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.
Symbols: Mulberry Symbols, © 2018–2026 Steve Lee, CC BY-SA 4.0: CC BY-SA 4.0, the set.
Opening the book…
4.2: Resources is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by LibreTexts.
The book could not be loaded just now.