D <=> A
D : Diaphantine equations
eg.
A = Automorphic Form (eg. Elliptic Curves used in highest Cryptography “ECC” )
Fermat’s Last Theorem: after failures of 350 yrs, Andrew Wiles in 1994 proved easier from reversed direction A to D.
Lycée Pierre de Fermat (Maths Supérieures & Spéciales @Toulouse, France) was my Alma mater。
https://www.quantamagazine.org/amazing-math-bridge-extended-beyond-fermats-last-theorem-20200406/