System.Numerics is available in .Net Standard, use it; enable Native in net40

src/FSharp/FSharp-Portable47.fsproj.paket.references

@@ -1,2 +0,0 @@
-FSharp.Core framework:portable-net45+sl5+netcore45
-FSharp.Compiler.Tools

src/FSharp/FSharp.fsproj

@@ -1,18 +1,20 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net45;netstandard1.6</TargetFrameworks>
+    <TargetFrameworks>net45;netstandard1.6;netstandard2.0</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <AssemblyName>MathNet.Numerics.FSharp</AssemblyName>
     <RootNamespace>MathNet.Numerics</RootNamespace>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <OutputType>Library</OutputType>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+    <IsPackable>true</IsPackable>
   </PropertyGroup>
-
   <PropertyGroup Condition="'$(TargetFramework)'=='netstandard1.6'">
-    <DefineConstants>NETSTANDARD;NOSYSNUMERICS</DefineConstants>
+    <DefineConstants>NETSTANDARD</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+    <DefineConstants>NETSTANDARD</DefineConstants>
   </PropertyGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\Numerics\Numerics.csproj" />
   </ItemGroup>

src/FSharpUnitTests/FSharpUnitTests.fsproj

@@ -3,12 +3,11 @@
     <TargetFrameworks>net45;netcoreapp1.1;netcoreapp2.0</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <OutputType>Exe</OutputType>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
-
   <PropertyGroup Condition="$(TargetFramework.Contains('netcoreapp')) OR $(TargetFramework.Contains('netstandard'))">
-      <DefineConstants>NETSTANDARD;NOSYSNUMERICS</DefineConstants>
+      <DefineConstants>NETSTANDARD</DefineConstants>
   </PropertyGroup>
-
   <ItemGroup>
     <PackageReference Include="FsUnit" Version="3.0.*" />
     <PackageReference Include="NUnit" Version="3.8.*" />

src/Numerics/Numerics.csproj

@@ -38,9 +38,16 @@
         <GenerateAssemblyInfo>true</GenerateAssemblyInfo>
         <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
+        <NoWarn>1701;1702;1705;1591</NoWarn>
     </PropertyGroup>
     <PropertyGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
-        <DefineConstants>NETSTANDARD;NOSYSNUMERICS</DefineConstants>
+        <DefineConstants>NETSTANDARD</DefineConstants>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+        <DefineConstants>NETSTANDARD</DefineConstants>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(TargetFramework)'=='net40'">
+        <DefineConstants>NATIVE</DefineConstants>
     </PropertyGroup>
     <ItemGroup Condition="'$(TargetFramework)' == 'net40'">
         <Reference Include="System" />

src/Numerics/Random/CryptoRandomSource.cs

@@ -47,7 +47,7 @@ namespace MathNet.Numerics.Random
         /// <summary>
         /// Construct a new random number generator with a random seed.
         /// </summary>
-        /// <remarks>Uses <see cref="System.Security.Cryptography.RNGCryptoServiceProvider"/> and uses the value of
+        /// <remarks>Uses <see cref="System.Security.Cryptography.RandomNumberGenerator"/> and uses the value of
         /// <see cref="Control.ThreadSafeRandomNumberGenerators"/> to set whether the instance is thread safe.</remarks>
         public CryptoRandomSource()
         {
@@ -67,7 +67,7 @@ namespace MathNet.Numerics.Random
         /// <summary>
         /// Construct a new random number generator with random seed.
         /// </summary>
-        /// <remarks>Uses <see cref="System.Security.Cryptography.RNGCryptoServiceProvider"/></remarks>
+        /// <remarks>Uses <see cref="System.Security.Cryptography.RandomNumberGenerator"/></remarks>
         /// <param name="threadSafe">if set to <c>true</c> , the class is thread safe.</param>
         public CryptoRandomSource(bool threadSafe) : base(threadSafe)
         {

src/TestData/TestData.csproj

@@ -4,6 +4,7 @@
         <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
         <AssemblyName>MathNet.Numerics.TestData</AssemblyName>
         <RootNamespace>MathNet.Numerics.TestData</RootNamespace>
+        <IsPackable>false</IsPackable>
     </PropertyGroup>
     <PropertyGroup Condition="'$(TargetFramework)'=='netstandard1.1'">
         <DefineConstants>NETSTANDARD</DefineConstants>

src/UnitTests/UnitTests.csproj

@@ -7,9 +7,10 @@
         <BaseIntermediateOutputPath>..\..\obj\test\$(Configuration)</BaseIntermediateOutputPath>
         <AssemblyName>MathNet.Numerics.UnitTests</AssemblyName>
         <RootNamespace>MathNet.Numerics.UnitTests</RootNamespace>
+        <IsPackable>false</IsPackable>
     </PropertyGroup>
     <PropertyGroup Condition="$(TargetFramework.Contains('netcoreapp')) OR $(TargetFramework.Contains('netstandard'))">
-        <DefineConstants>NETSTANDARD;NOSYSNUMERICS</DefineConstants>
+        <DefineConstants>NETSTANDARD</DefineConstants>
     </PropertyGroup>
     <ItemGroup Condition="'$(TargetFramework)' == 'net45'">
         <Reference Include="System" />