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 Apr16 asked How should the Calculus of Variations deal with $\delta(t-t_0)$ variations? Mar2 awarded Good Question Sep4 asked How has the definition of a tensor changed since Tullio Levi-Civita's definition? Aug31 comment Is a linear transformation just a mathematical description of a straight line? @CameronWilliams ah, I can see you're right; so I should have said that a linear transformation maps the independent untransformed variables lying on a straight line; to the transformed variable also lying on a straight line. Aug31 asked Is a linear transformation just a mathematical description of a straight line? Jul2 awarded Curious Jun27 comment what's a homogeneous transformation? @PeterFranek I've edited in the context of the question Jun27 revised what's a homogeneous transformation? clarify context of question Jun27 asked what's a homogeneous transformation? Apr23 awarded Tumbleweed Apr7 awarded Popular Question Mar1 asked Can the Euler-Lagrange equations be derived from a variation over a time of order $dt$ rather than $t$? Feb22 comment Does every continuous function have a left and right derivative? I wouldn't have believed it was possible at the time Feb21 accepted Does every continuous function have a left and right derivative? Feb21 asked Does every continuous function have a left and right derivative? Nov21 comment Is invariance of a multi-linear form required for co/contra variance? I was trying to help you get to answering the point of my question, it wasn't meant to be an interrogation ;) So let me put it another way: what calculation do we perform on the components of a tensor that makes it "invariant"? I suspect we create a multilinear form from its components and its dual tensor, and this is an invariant. BTW, I'm learning tensors from scratch using this book, so pardon my ignorance. Nov20 comment Is invariance of a multi-linear form required for co/contra variance? Is the multilinear form in the OP quote always invariant to a change in coordinates: yes or no? Nov15 awarded Promoter Nov14 revised Is invariance of a multi-linear form required for co/contra variance? removed unnecessary tag Nov13 asked Is invariance of a multi-linear form required for co/contra variance?