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LaTeX, Missing $ error, Math homework, how to fix?
Good afternoon! Please tell me how to fix the errors, I can’t understand: either I have too many or too few dollars, I tried it in different ways (Overleaf). In red crosses is: Missing $. Are there any error editors? I'm just a beginner :) My math homework
\section*{Aufgabe 1}
F\"ur welche nat\"urlichen Zaheln $n$ gilt die Ungleichung $$2^n\geq n^2, \quad \forall n\ geq4.$$
Beweise:
Der Induktionsanfang für $n=4$ ergibt sich mit $$2^4=16\geq16=4^2.$$
Der Induktionsshritt: $$2^{n+1}=2\times 2^n
\begin{tabular}[t]{l}
\geq 2\times n^2 = n^2+n\times n $$\\
\geq $$n^2+4\times n=n^2+2 \times n+2\times n$$\\
\geq $$n^2+2\times n+2\times 4$$\\
\geq $$n^2+2\times n+1 $=$$ (n+1)^2$$
\end{tabular}
\begin{flushright}
\blacksquare
\end{flushright}
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\section*{Aufgabe 1}
F\"ur welche nat\"urlichen Zaheln $n$ gilt die Ungleichung
\[
2^n \geq n^2, \quad \forall n \geq 4.
\]
Beweise:
Der Induktionsanfang für $n=4$ ergibt sich mit
\[
2^4 = 16 \geq 16= 4^2.
\]
Der Induktionsshritt:
\begin{equation*}
\begin{split}
2^{n+1} = 2 \times 2^n & \geq 2 \times n^2 = n^2 + n \times n \\
& \geq n^2 + 4 \times n = n^2 + 2 \times n + 2 \times n \\
& \geq n^2 + 2 \times n + 2 \times 4 \\
& \geq n^2 + 2 \times n + 1 = (n + 1)^2
\end{split}
\end{equation*}
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