ClassLibrary.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <EnableDefaultItems>false</EnableDefaultItems>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include="Class.cs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
  </ItemGroup>

</Project>