(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Here is the context:

suppose [itex]f=(f_1,...,f_{n+1})[/itex] is a smooth retraction of [itex]B^{n+1}[/itex] onto [itex]S^n[/itex]

But what does the following statement mean?

[itex]\int _{S^n}f_1df_2\wedge df_3 \wedge ... \wedge df_{n+1}[/itex]

2. Relevant equations

3. The attempt at a solution

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# What does this notation mean

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