Semi-Lagranging schemes have been explored by several authors recently for transport problems in particular for moving interfaces using level set method. We incorporate the backward error compensation method developed in [2] into the semi-Lagranging schemes with almost the same simplicity and three times the complexity of a first order semi-Lagranging scheme but improve the order of accuracy. W...

One way to characterize students' representations is to distinguish between concrete, semi-concrete, semi-abstract and abstract representations. In a previous study with 6-year olds we surprisingly found that – while solving a combinatorial task the children who used semi-concrete representations in their documentations were more systematic in the process of finding solutions with less duplicat...