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Help me with Fermat's last theorem

di Giuseppe Macario
il Sat, 21 Apr 2007 17:12:13 +0200
newsgroups it.cultura.linguistica.inglese
message-id <462a29cd$0$4787$4fafbaef@reader4.news.tin.it>

...surely not to prove it :-)
Joking apart here's my question:
a^n + b^2 = c^n has no solutions for n>2. I wonder how you read a^n. 
I've got five alternatives:
1. a to the n
2. a to the n-th
3. a to the n power
4. a to the n-th power
5. a to the power n
Which is/are correct?

TIA, Giuseppe
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