5 ms·

I wrote another blog post on the topic, with lots of pictures and simple explanations: Intro to Lie groups for rigid rotations https://daniel.lawrence.lu/blog/

by dllu 4y ago

I wrote another blog post on the topic, with lots of pictures and simple explanations: Intro to Lie groups for rigid rotations https://daniel.lawrence.lu/blog/y2021m07d14/ https://daniel.lawrence.lu/blog/y2021m07d14/

tgv 4y ago
> lots of pictures and simple explanations Just some observations on that: - a random picture of Le petit Prince doesn't make it easier to understand - there's a huge difference between people that don't know that you'll end up in the same place if you keep walking on a sphere and those that won't quit at "closure: A \oplus B is still in the group". - "Rotations in 2D" doesn't explain things, it just states them. It requires reasonable understanding of all concepts. - There are also detractors, like "However, locally, they are like \mathbb R^1, a trivial 1-dimensional Euclidean space." It isn't clear why that is meaningful. This is not meant as criticism, just to point out that the entry level for your blog might be higher than you think/intended.
- dllu 4y ago
  Thanks, very useful feedback!
  - jessriedel 4y ago
    Is dllup able to generate equation references with named labels, like the way LaTeX uses \label and \ref? (I looked at the "References" section of the dllup documentation, and it looks like you have to know the equation number that is going to get generated, e.g., #eq3., but I'm wondering if there is alternative syntax.) If not, is there an alternative format for putting math on the web that you like that supports this? (Just asking in case I ever move away from my ancient Wordpress installation with the QuickLaTeX plugin.)
    - dllu 4y ago
      When compiling dllup to LaTeX, it is possible to just use \label but I haven't implemented that functionality in dllup to html yet. You can also consider pandoc's markdown flavor that supports equations and references: https://pandoc.org/MANUAL.html#pandocs-markdown https://pandoc.org/MANUAL.html#pandocs-markdown
      - jessriedel 4y ago
        Thanks!
- marginalia_nu 4y ago
  Often these pieces are written for the author's benefit, to help them sort out a topic in their head, more so than as a genuine attempt at education. Thus, they tend to be at the level of the author rather than some imagined audience. That isn't wrong or anything I think. Not every piece of written text needs to be understandable by everyone.
- jessriedel 4y ago
  > - a random picture of Le petit Prince doesn't make it easier to understand The post has 5 pictures, 4 technical pictures plus the picture of Le petit Prince that is whimsical while simultaneously illustrating a non-trivial point. > This is not meant as criticism, This is clearly criticism. You intend it as constructive criticism, and that's great, but it's criticism.
snthpy 4y ago
Thanks. That was really nice!

by dllu 4y ago

tgv 4y ago

> lots of pictures and simple explanations Just some observations on that: - a random picture of Le petit Prince doesn't make it easier to understand - there's a huge difference between people that don't know that you'll end up in the same place if you keep walking on a sphere and those that won't quit at "closure: A \oplus B is still in the group". - "Rotations in 2D" doesn't explain things, it just states them. It requires reasonable understanding of all concepts. - There are also detractors, like "However, locally, they are like \mathbb R^1, a trivial 1-dimensional Euclidean space." It isn't clear why that is meaningful. This is not meant as criticism, just to point out that the entry level for your blog might be higher than you think/intended.

dllu 4y ago
Thanks, very useful feedback!
- jessriedel 4y ago
  Is dllup able to generate equation references with named labels, like the way LaTeX uses \label and \ref? (I looked at the "References" section of the dllup documentation, and it looks like you have to know the equation number that is going to get generated, e.g., #eq3., but I'm wondering if there is alternative syntax.) If not, is there an alternative format for putting math on the web that you like that supports this? (Just asking in case I ever move away from my ancient Wordpress installation with the QuickLaTeX plugin.)
  - dllu 4y ago
    When compiling dllup to LaTeX, it is possible to just use \label but I haven't implemented that functionality in dllup to html yet. You can also consider pandoc's markdown flavor that supports equations and references: https://pandoc.org/MANUAL.html#pandocs-markdown https://pandoc.org/MANUAL.html#pandocs-markdown
    - jessriedel 4y ago
      Thanks!
marginalia_nu 4y ago
Often these pieces are written for the author's benefit, to help them sort out a topic in their head, more so than as a genuine attempt at education. Thus, they tend to be at the level of the author rather than some imagined audience. That isn't wrong or anything I think. Not every piece of written text needs to be understandable by everyone.
jessriedel 4y ago
> - a random picture of Le petit Prince doesn't make it easier to understand The post has 5 pictures, 4 technical pictures plus the picture of Le petit Prince that is whimsical while simultaneously illustrating a non-trivial point. > This is not meant as criticism, This is clearly criticism. You intend it as constructive criticism, and that's great, but it's criticism.

snthpy 4y ago

Thanks. That was really nice!