Q&A

# Notation for nested exponents

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An expression such as $a^{b^c}$ is usually interpreted as $a^{(b^c)}$ and not as ${(a^b)}^c$. (See, for example, the Wikipedia entry for double exponential function.) Is there a reputable source that states how an expression such as $a^{b^{c^{\cdots^n}}}$ is to be interpreted?

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