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  • 0 posts edited
  • 1 helpful flag
  • 23 votes cast
Jun
21
answered The limit of a product of functions equals the product of the limits: Is this proof rigorous?
Jun
19
asked The limit of a product of functions equals the product of the limits: Is this proof rigorous?
May
11
asked Must the definition of the limit of a complex function be an inequality?
Apr
16
asked How should the Calculus of Variations deal with $\delta(t-t_0)$ variations?
Mar
2
awarded  Good Question
Sep
4
asked How has the definition of a tensor changed since Tullio Levi-Civita's definition?
Aug
31
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.
Aug
31
asked Is a linear transformation just a mathematical description of a straight line?
Jul
2
awarded  Curious
Jun
27
comment what's a homogeneous transformation?
@PeterFranek I've edited in the context of the question
Jun
27
revised what's a homogeneous transformation?
clarify context of question
Jun
27
asked what's a homogeneous transformation?
Apr
23
awarded  Tumbleweed
Apr
7
awarded  Popular Question
Mar
1
asked Can the Euler-Lagrange equations be derived from a variation over a time of order $dt$ rather than $t$?
Feb
22
comment Does every continuous function have a left and right derivative?
I wouldn't have believed it was possible at the time
Feb
21
accepted Does every continuous function have a left and right derivative?
Feb
21
asked Does every continuous function have a left and right derivative?
Nov
21
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.
Nov
20
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?