Bold text and symbol

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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