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Adding a button to skip ads specifically for each math PDF link involves a bit of technical know-how and could be approached in a few ways:

1. **Browser Extension:** Develop or use a browser extension that detects math PDF links and adds a custom button next to them. When clicked, the extension could redirect the user directly to the PDF link, bypassing any intermediate pages or ads.

2. **Custom Script:** Create a custom script or userscript (using tools like Greasemonkey or Tampermonkey) that runs on the webpage where these links appear. The script would identify math PDF links, modify the DOM to insert a skip button, and handle the redirection upon button click.

3. **Bookmarklet:** Develop a bookmarklet that, when clicked, scans the page for math PDF links, adds a skip button dynamically, and allows users to directly access the PDF without navigating through ads.

Each method requires understanding the structure of the webpage where these links are hosted and possibly some JavaScript skills to manipulate the DOM and handle link redirections effectively. Always ensure your approach complies with legal and ethical guidelines regarding content access and ad skipping.