Hallo John,
many thanks for your answer.
Yes, I agree, The condition I wrote is true only for low order elements.
For serendipity, and maybe also second order, elements it is not true.
For second order, some basis functions have zero integral.
Actually the difference that I have founds more rela
On Wed, May 22, 2019 at 10:03 AM John Peterson wrote:
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>
> On Wed, May 22, 2019 at 3:30 AM marco wrote:
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>> Mass lumping is defined by using trapezoidal quadrature rule.
>> In this way, the weights of a trapezoidal rule should be the integral over
>> the element of each basis function.
>>
>
I
