Objective
is to represent bold text or symbol in LaTeX.
Example 1. Bold Text
Code
Hello! Welcome to the \\textbf{Study Astrophysics}.
Result
$latex
\\text{Hello! Welcome to the } \\textbf{Study Astrophysics}.
$
Example 2. Bold inside an equation
Code
\\mathbf{A} \\cdot \\mathbf{B} \\equiv AB \\cos\\theta
Result
$latex
\\mathbf{A} \\cdot \\mathbf{B} \\equiv AB \\cos\\theta
$
Example 3. Bold Symbol
Code
\\boldsymbol{\\lambda}
Result
$latex
\\boldsymbol{\\lambda}
$
Reference
https://www.sharelatex.com/learn/Bold,_italics_and_underlining
http://study-astrophysics.com/griffiths-01-01/
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