2016-04-22 18:32:10 -0500 | received badge | ● Famous Question (source) |

2015-05-09 14:40:00 -0500 | received badge | ● Notable Question (source) |

2012-12-21 07:09:57 -0500 | received badge | ● Popular Question (source) |

2011-05-20 23:21:12 -0500 | received badge | ● Nice Question (source) |

2011-05-20 15:38:51 -0500 | received badge | ● Student (source) |

2011-05-18 20:47:46 -0500 | received badge | ● Editor (source) |

2011-05-18 10:20:46 -0500 | asked a question | Matrix/Tensor derivative for Stress Tensor I need to do define/calculate the following stress tensor in an elegant way: $T_{i,j} := -p \delta_{i,j} + \eta (\partial_i v_j + \partial_j v_i)$ where i,j can be x,y,z and $\partial_i v_j := \frac{\partial v_j}{\partial i}$ I've found the sage-function kronecker_delta for the first term, but I am having problems with the two partial derivatives. Thanks in advance! |

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.