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

\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

\mathbf{A} \cdot \mathbf{B} \equiv AB \cos\theta  

Example 3. Bold Symbol

Code

\boldsymbol{\lambda}

Result

\boldsymbol{\lambda}  

Reference

https://www.sharelatex.com/learn/Bold,_italics_and_underlining
http://study-astrophysics.com/griffiths-01-01/

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