Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
michael_nielsen's profile
michael_nielsen
michael_nielsen
michael_nielsen
@michael_nielsen

Tweets

michael_nielsen

@michael_nielsen

Searching for the numinous. Co-purveyor of https://quantum.country/ 

San Francisco, CA
michaelnielsen.org
Joined July 2008

Tweets

  • © 2019 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Matthew Cory‏ @TricksterDoesIt Nov 3
      • Report Tweet

      Matthew Cory Retweeted michael_nielsen

      Ask Emmy Noether.https://twitter.com/michael_nielsen/status/1191085975574728705 …

      Matthew Cory added,

      michael_nielsen @michael_nielsen
      On the oddly pervasive notion of the conservation of energy pic.twitter.com/j0iWw1sbTY
      Show this thread
      1 reply 0 retweets 0 likes
    2. michael_nielsen‏ @michael_nielsen Nov 3
      • Report Tweet
      Replying to @TricksterDoesIt

      michael_nielsen Retweeted michael_nielsen

      https://twitter.com/michael_nielsen/status/1191173191818870784 …

      michael_nielsen added,

      michael_nielsen @michael_nielsen
      Another topic: some people are replying "Isn't this Noether's theorem?" But that misses the the point. Of course, once you're in Lagrangian mechanics & have time-translation invariance, conservation follows. And there's an analogous quantum argument...
      Show this thread
      1 reply 0 retweets 0 likes
    3. michael_nielsen‏ @michael_nielsen Nov 3
      • Report Tweet
      Replying to @michael_nielsen @TricksterDoesIt

      michael_nielsen Retweeted Matthew Cory

      Can you provide a reference for this statement, that doesn't assume some prior structure (Lagrangian mechanics, unitary evolution in a Hilbert space, etc)?https://twitter.com/TricksterDoesIt/status/1191179505991376896 …

      michael_nielsen added,

      Matthew Cory @TricksterDoesIt
      Replying to @michael_nielsen
      Symmetries in NATURE lead directly to conservation laws.
      1 reply 0 retweets 0 likes
    4. Matthew Cory‏ @TricksterDoesIt Nov 3
      • Report Tweet
      Replying to @michael_nielsen

      For example: https://www.asc.ohio-state.edu/gan.1/teaching/winter10/Chapter4.pdf …

      1 reply 0 retweets 0 likes
      michael_nielsen‏ @michael_nielsen Nov 3
      • Report Tweet
      Replying to @TricksterDoesIt

      Those examples all appear to assume Lagrangian mechanics, or unitary evolution under some Hamiltonian.

      6:38 PM - 3 Nov 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Matthew Cory‏ @TricksterDoesIt Nov 3
          • Report Tweet
          Replying to @michael_nielsen

          I wouldn't accept SUSY without experiment. "Since symmetries are defined with respect to the laws they have not only direct empirical significance, but also indirect empirical significance" http://philsci-archive.pitt.edu/1436/ pic.twitter.com/xWYWIPZEfh

          1 reply 0 retweets 0 likes
        2. Matthew Cory‏ @TricksterDoesIt Nov 3
          • Report Tweet
          Replying to @TricksterDoesIt @michael_nielsen

          Scientists cannot access the "causal nexus." They just make maps and many times different maps predict the same thing. Example: https://arxiv.org/abs/gr-qc/0405033 …

          0 replies 0 retweets 0 likes
          3. End of conversation

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2019 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info