# Some remarks on mixed problems

## TL;DR

This paper discusses a method for representing symbols in a ps.d.o. using two bases and a lifting functional, grounded in an invariance principle and boundary conditions.

## Contribution

It introduces a novel approach to symbol representation in ps.d.o. leveraging dual bases and boundary conditions based on invariance principles.

## Key findings

- Successful representation of symbols using the proposed method
- The approach is grounded in invariance principles and boundary conditions
- Potential applications in symbolic analysis and processing

## Abstract

I will attempt to represent a symbol to a ps.d.o., using two bases and a lifting functional. The representation is based upon an invariance principle and conditions on the boundary, defined by first surfaces to the symbol.