12 questions linked to/from Custom atomic expressions - modern tutorial
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### How to create expanding summary boxes like the ones displayed for InterpolatingFunction, NearestFunction, etc.?

The display forms for objects like ClassifierFunction are nice clickable summary boxes I like this, and now I'm trying to create my a custom version of this for my ...
769 views

### Language* documentation project

Language context is around for a long time. It is also heavily used (APIFunctions / FormFunctions dependencies deployment rely on it). It is undocumented and ...
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### List of atomic expressions

I was surprised to see Graph objects are atomic. Is there a way (through documentation or programmatically) to find all atomic heads? The ones I know of are: <...
596 views

### Make my data-structure atomic

Lately, and by lately I mean since version 7 or so, the number of atomic expressions in Mathematica constantly grew. In former times only the native types like integers and optimised arrays were ...
746 views

### Pascal records and Mathematica programming

Background: "experienced" Pascal-programmer (DOS-era, never got into OOP) proud owner of Mathematica ver 11.2 have used Mathematica for years to do my share of number crunching and plotting to ...
173 views

### Is it possible to create lookups on temporary symbols that still allow the symbols to be automatically removed?

Is there some way to create lookups keyed on Temporary symbols that somehow avoid the referencing of the Temporary symbols, ...
119 views

### Making an expression to Iceberg-like object?

Can we construct a function Iceberg, which maps a given expression X to Iceberg[X] satisfying 1. and 2. and 3. ? 1. From Iceberg[X], it is not possible to inspect/extract a part of X with usual ...
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### How would one add Hyperreals as a new type to Mathematica?

Hyperreals are an extension to the real numbers; they formalise the concepts of infinities and infinitestimals as numbers, rather than the named limit points outside of the system of reals and form ...
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### Is there a good reason why Slot[] is not an atomic expression?

Here's a good reason why I think it should be, Map[ If[AtomQ@#, #->"is an atom", #->"not an atom"]& , {"hello",Range@3, # &} , {-1} ] ...
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### Type formation rules for 1-position expressions

I made a summary of the rules for formation of types for simple 1-position expressions, as I understand them. Here it is in textual form: A symbol, say, α, is a discrete entity, represented by a ...
### SystemPrivate*Entry* and *Valid*, or: How does Mathematica know which expression is which?
Goal The answers to this question are intended to be a place to describe the behavior and mechanism of the undocumented functions of the form SystemPrivate*Entry* ...