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From (1)---- c^n/2<a^n/2+b^n/2
From(2) ----c^n/2<(a+b)^n/2
So-----a^n/2+b^n/2=(a+b)^n/2
Ok from your equations ; that is (2) comes from (1),
Just put c=2 , a=3 and b=4 , n=4
then,
(1) -> 4 < 9+16
(2) -> 4< (3+4)^2 =49
So according to you SO LEFT SIDE IS EQUAL , RIGHT SIDE SHOULD BE EQUAL.
so 9+16 = 49 ???
It seems like a contradiction , he is trying to prove contradiction and hence the theorem.
above case is valid for n=2 only.
then,
(1) -> 4 < 3+4 = 7
(2) -> 4< (3+4)^1 =7
Ultimately following formation is wrong,
From (1)---- c^n/2<a^n/2+b^n/2
From(2) ----c^n/2<(a+b)^n/2
So-----a^n/2+b^n/2=(a+b)^n/2
it should be rearranged like,
From (1)---- c^n/2<a^n/2+b^n/2
From(2) ----c^n/2<(a+b)^n/2
For n=2 ---- a^n/2+b^n/2=(a+b)^n/2
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somewhere in top, you can find following statement , which is again not true ,
In c^n/2<a^n/2+b^n/2
c,a,b are common and
n/2 is variable.
n is not a variable for this contradiction . n is already assumed as integer 2 .
If the presentation formatted according to mathematical notations , then it would have more attention . Other than that the method has no flaw.
Good luck .