\documentclass{article}
\usepackage[]{amsmath}
\usepackage[]{amsthm}
\numberwithin{equation}{section}
\usepackage[]{amssymb}
\usepackage[a4paper, total={6in, 8in}]{geometry}
\usepackage[]{soul}
\usepackage[]{bbm}
\usepackage[]{cancel}
\usepackage[]{xcolor}
\usepackage[]{enumitem}
\usepackage{mathrsfs}

% \usepackage[]{enumerate}
\setlength\parindent{0pt}


\newcommand{\bbP}{\mathbb{P}}
\newcommand{\E}{\mathbb{E}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\N}{\mathbb{N}}
\newcommand{\p}{\mathfrak{p}}
\newcommand{\mft}{\mathfrak{t}}
\newcommand{\f}{\mathfrak{f}}
\newcommand{\C}{\mathfrak{C}}
\newcommand{\n}{\mathscr{N}}

\newtheorem{theorem}{Theorem}[section]
\newtheorem{corollary}{Corollary}[theorem]
\newtheorem{lemma}[theorem]{Lemma}

\title{Reformulation without f}
\author{Shakil Rafi}
\begin{document}
\maketitle  












\end{document}