%0 Journal Article %T Fermat and Pythagoras Divisors for a New Explicit Proof of Fermat&#8217;s Theorem:a4 + b4 = c4. Part I %A Prosper Kouadio Kimou %A Franç %A ois Emmanuel Tanoé %A Kouassi Vincent Kouakou %J Advances in Pure Mathematics %P 303-319 %@ 2160-0384 %D 2024 %I Scientific Research Publishing %R 10.4236/apm.2024.144017 %X In this paper we prove in a new way, the well known result, that Fermat&#8217;s equation<i> </i><i>a</i><sup>4</sup> + <i>b</i><sup>4</sup> = <i>c</i><sup>4</sup>, is not solvable in <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'> <mi>&#x2115;</mi> </math> , when <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'> <mrow> <mi>a</mi><mi>b</mi><mi>c</mi><mo>&#x2260;</mo><mn>0</mn></mrow> </math> . To show this result, it suffices to prove that: <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'> <mrow> <mrow><mo>(</mo> <mrow> <msub> <mi>F</mi> <mn>0</mn> </msub> </mrow> <mo>)</mo></mrow><mo>:</mo><msubsup> <mi>a</mi> <mn>1</mn> <mn>4</mn> </msubsup> <mo>+</mo><msup> <mrow> <mrow><mo>(</mo> <mrow> <msup> <mn>2</mn> <mi>s</mi> </msup> <msub> <mi>b</mi> <mn>1</mn> </msub> </mrow> <mo>)</mo></mrow></mrow> <mn>4</mn> </msup> <mo>=</mo><msubsup> <mi>c</mi> <mn>1</mn> <mn>4</mn> </msubsup> </mrow> </math> , is not solvable in <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'> <mi>&#x2115;</mi> </math> , (where <math display='inline' xmlns='http://www.w3.org/1998/Math/MathML'> <mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mn>,</mn><msub> <mi>b</mi> <mn>1</mn> </msub> <mn>,</mn><msub> <mi>c</mi> <mn>1</mn> </msub> <mo>&#x2208;</mo><mn>2</mn><mi>&#x2115;</mi><mo>+</mo><mn>1</mn></mrow> </math> , pairwise primes, with necessarly <math display='inline' %K Factorisation in ℤ %K Greatest Common Divisor %K Pythagoras Equation %K Pythagorician Triplets %K Fermat's Equations %K Pythagorician Divisors %K Fermat's Divisors %K Diophantine Equations of Degree 2 %K 4-Integral Closure of ℤ %K in ℚ %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=132813