Yo tumblr users.  You may have noticed that tumblr does not have a TrackBack field. But you want to use it anyway.

Here is how to do it. Only works if you use Linux, Mac, or Windows PowerShell, and you know how to open a terminal.

I wanted to submit a TrackBack request to the arXiv, which told me to aim my ping at in order to cite  It’s a free general relativity textbook that gave me the idea for the post Time Is Like Space.

Here is what I did to convey that:

  1. Open a terminal.
  2. Type curl -d url="" -d title="Time Is Like Space" -d blog_name="Human Mathematics" -d excerpt="in the old view, time was something separate and distinct from space: S³×T. Now, in the modern view, time is another kind of thing that's just like space: S⁴."  (No line breaks, or if you do, precede them with a ).
  3. Hit enter.
  4. Receive confirmation that looks like:
    <?xml version="1.0" encoding="utf-8"?>
    .  If you get something much longer, ur doin it wrong.

A simpler version would have been curl -d url=""

One thing the curl utility does, is it allows you to send POST requests from the terminal.  Normally when you type an address into your browser or click on a link, the browser (Safari or whatever) sends a GET request and that is what tells to send you the latest on Beanie Babies.

For more details on the utility, type man curl into your terminal.


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