This is my source code

and this is the output

I want the word seconds to be in bold and not italics like the rest and I can't figure out why it's different. Any help would be appreciated.

  • 3
    \epsilon is a math mode command you must have had an error at that point, The pdf is not intended to be used after any error. Apr 11 at 18:03
  • 1
    The command \epsilon is only valid in math mode, LaTeX is attempting to help by starting math mode for you but then it never leaves math mode. Also I think what you actually want is \in.
    – Willoughby
    Apr 11 at 18:03
  • 2
    $t \in [0,5]$ (I think you mean \in not \epsilion ? Apr 11 at 18:03
  • 4
    Note that in this case it was easy enough to spot by eye but in general it is hard to debug an image, it is better to provide the example as a small complete document as text so people can debug it. Apr 11 at 18:06
  • 1
    Off-topic: Why do you render so much of the material in bold?
    – Mico
    Apr 11 at 18:22

You need to replace t \epsilon [0,5] with $t \in [0,5]$. I.e., two changes are needed:

  • use inline math mode for math material, and

  • change \epsilon to \in.

A full MWE -- note that I would not render the paragraph in bold and that I would use the machinery of the siunitx package to typeset numbers and their associated scientific units. (If you insist on using bold for the text part, you should also make an effort to render the math part in bold.

enter image description here

\usepackage{siunitx} % for '\SI' macro

\setcounter{section}{1}  % just for this example


Compute the complete solution to the ordinary differential 
equation with input $x(t)=0$ assuming the circuit elements 
are $R=\SI{0.5}{\ohm}$, $L=\SI{0.1}{H}$, $C=0$ and initial
conditions $y(0)=1$ and $dy(t)\,dt\mid t=0$. Use MATLAB to
plot your solution for time interval $t\in[0,5]$ seconds.


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