Help Solving Equation: Notation Explained

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The discussion focuses on solving an equation related to determining the minimum mass of a star, emphasizing the need for clarity in notation. Participants express a desire for explanations of the notation used in the equation to facilitate understanding. A link to a relevant resource is provided to assist those looking for context or additional information. The request highlights the importance of clear communication in mathematical discussions. Understanding the notation is crucial for effectively solving the equation presented.
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I need some help solving the following:

IbWUIDYrGUPVc4Dnp6ybm36D4ICWczd5KAoN2yi5djPe77pbLcfmaAG7VbXb41M55pOKucX-gZMF6fmVT_tsLaNiDaZ3nefQ.png

The part that really trips me up is dealing with the notation. It would really help if you explained it as well.
 
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Also it is in the context of finding the minimum mass of a star possible with the equation:
Capture.PNG
 
If you can tell us where you found that equation (e.g. link to web page, or page reference to a book), it might help people who want to answer.
 
Oops! Sorry here it is: http://www.thphys.may.ie/staff/mshadmehri/AstroNotes/MINIMUM.pdf
 
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