Proof of the Linderlof hypothesis
Proof of the Poincare' conjecture
Proof of the Riemann Hypothesis from a power-sum result under the density hypothesis
Proper congruence-preserving extensions of lattices
Properties and applications of the prime detecting function: infinitude of twin primes, asymptotic law of distribution of prime pairs differing by an even number
Properties and Problems related to Smarandache Type Functions
Properties of proper rational numbers
Proving the existence of the $n$th root by induction
Pseudo-Manifold Geometries with Applications
Pythagorean Triangles with Repeated Digits-Repeated Bases
Pythagorean triangles within Pythagorean triangles