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![PARTIAL DERIVATIVE SYMBOL. Mathematical Operators Sign. Benner in subtle sepia tone. Digital graphic, icon. Elegant, totally black background. Stock Illustration | Adobe Stock PARTIAL DERIVATIVE SYMBOL. Mathematical Operators Sign. Benner in subtle sepia tone. Digital graphic, icon. Elegant, totally black background. Stock Illustration | Adobe Stock](https://as1.ftcdn.net/v2/jpg/04/34/01/54/1000_F_434015440_vitLGr1hftYhRljOF6DCBc84JRzJYXpJ.jpg)
PARTIAL DERIVATIVE SYMBOL. Mathematical Operators Sign. Benner in subtle sepia tone. Digital graphic, icon. Elegant, totally black background. Stock Illustration | Adobe Stock
![A text-book of human physiology . thstanding the changein form of the vibration the period of the fundamental tone remainsunchanged. But if these partial tones are not to be regarded as A text-book of human physiology . thstanding the changein form of the vibration the period of the fundamental tone remainsunchanged. But if these partial tones are not to be regarded as](https://c8.alamy.com/comp/2CE6REX/a-text-book-of-human-physiology-thstanding-the-changein-form-of-the-vibration-the-period-of-the-fundamental-tone-remainsunchanged-but-if-these-partial-tones-are-not-to-be-regarded-as-mere-mathematicalfictions-if-they-have-a-real-existence-they-should-produce-some-mechanicaleffect-which-is-recognizalle-such-an-effect-we-find-in-the-phenomenon-ofsympathetic-vibration-resonance-occurring-in-all-bodies-which-once-theyare-given-the-impetus-run-through-a-series-of-different-vibrations-before-theycome-to-rest-the-simplest-example-of-this-is-witnessed-when-a-certain-noteis-sung-into-a-p-2CE6REX.jpg)