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The "Druid's Prayer" (Welsh: Gweddi'r Derwydd) or "Gorsedd Prayer" (Gweddi'r Orsedd) is a prayer composed by Iolo Morganwg which is still a staple in the ritual of both gorseddau and Neo-Druidism. Neo-Druids sometimes substitute the words y Dduwies ("the Goddess") for the original Duw ("God").
Let : be a smooth map of smooth manifolds. Given , the differential of at is a linear map : from the tangent space of at to the tangent space of at (). The image of a tangent vector under is sometimes called the pushforward of by .