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Added Dagger and Double Dagger Symbols to AsciiMath #149

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I added the dagger (†) and double dagger (‡) symbols to AsciiMath. Below are the details of their implementation:

  • AsciiMath: dag
    LaTeX: \dagger
    Unicode: U+2020

  • AsciiMath: ddag
    LaTeX: \ddagger
    Unicode: U+2021

While daggers are primarily used as symbols, such as for the adjoint operator or in certain Galois theory contexts, I decided to categorize them under "binary operation symbols" in AsciiMath. This decision aligns with their classification in "The Comprehensive LaTeX Symbol List" and the LaTeXMathML.js file.

Testing Done:
I added the dagger symbols to unittests.js and ran the tests by opening unittests.html in Firefox. All tests passed successfully.

Additionally, I verified the implementation in Chrome. Since Chrome version 114, MathML support has been fully integrated, allowing all tests to pass in Chrome as well. This means that MathML is now supported across all major browsers:
https://www.lambdatest.com/web-technologies/mathml-chrome

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