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RTk - The Raviart-Thomas vector-valued polynomial basis
This basis is described in Raviart and Thomas (Mathematical aspects of finite element methods, Springer, 1977). It is indicated in the space (see space(2)) by a string starting with the two letters "RT", followed by digits indicating the polynomial order.
This basis recognizes the equispaced/warburton node option for degrees of freedom located on sides. See basis_option(2).
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