![](http://www.alamy.com/thumbs/6/FF4D357A-EF9C-4773-A2CC-FFB718F6CEE4/2E364FE.jpg)
Wood alphabet letter in word PDE (abbreviation of permitted daily exposure, partial differential equation or personal development education) on green
Wood alphabet letter in word PDE (abbreviation of permitted daily exposure, partial differential equation or personal development education) on green grass background
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Photo credit: © Thanee Hengpattanapong / Alamy / Afripics
License: Royalty Free
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Keywords: abbreviation, background, cleaning, daily, derivatives, development, differential, education, equation, exposure, function, grass, green, independent, learning, letter, mathematics, measurement, multiple, multivariable, partial, permitted, personal, pharmaceutical, problem, qualification, relation, science, solution, study, unknown, validation, variable, word