Kulkarni-Nomizu product

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The Kulkarni-Nomizu product is defined for two (0,2)-tensors and gives as a result a (0,4)-tensor. If h and k are (0,2)-tensors, then the product is defined via:

h\circ k(e_1,e_2,e_3,e_4):=h(e_1,e_3)k(e_2,e_4)+h(e_2,e_4)k(e_1,e_3)-h(e_1,e_4)k(e_2,e_3)-h(e_2,e_3)k(e_1,e_4)
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