Function Invocation Stacks
Computer function invocations typically utilize stack data structures and add frames to them. Frames typically include register values, function arguments, and, function internal variable values.
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Python Types & Classes
In Python, types and classes are the same thing. Both inherit from the object class.
Measurement Problem
Quantum mechanics does not precisely define what causes the Schrödinger wave function to collapse because it does not precisely define what a measurement is. This is referred to as the measurement problem.
YAML
YAML (YAML Ain't Markup Language) is a superset of JSON (JavaScript Object Notation) supporting the encoding of data structures using significant whitespace, and, the encoding of strings without using quotes. For these and other reasons, YAML can typically encode key value pairs in a more user friendly format than JSON.
Agile Product Development Work Categories
Agile product development typically divides work into the following categories:
Research tasks are sometimes also referred to as spikes.
Unicode Symbols, Code Points & Encodings
Unicode associates symbols with bit strings referred to as code points. Code points can have various bit string encodings.
Baryons & Mesons
Baryons are quark triplet hadrons like protons and neutrons. Mesons are quark antiquark pair hadrons like pions and kaons. Baryons are fermions and mesons are bosons.
Hadrons, Leptons & Gauge Bosons
Hadrons are quark sets like protons and neutrons.
Leptons are "quarkless" half spin fermions like electrons and neutrinos.
Gauge bosons are spin one bosons like photons, W particles, Z particles and gluons.
Fermions & Bosons
Fermions are fractional spin particles like electrons, protons, neutrons, quarks and neutrinos.
Bosons are integer spin particles like photons, W particles, Z particles and gluons.
Bosons are force carriers.
CRUD Interfaces
Database user interfaces for reading, writing (adding and updating) and deletion are referred to as CRUD interfaces.
Positivism
Positivism is the belief that knowledge comes only from measurements and reasoning about measurements. Positivists ignore what cannot be measured. Positivism was helpful in the development of general relativity and quantum mechanics.
Data Lakes, Data Warehouses & Data Lakehouses
Data lakes are unstructured data optimized data stores.
Data warehouses are structured data optimized data stores.
Data lakehouses are structured and unstructured data optimized data stores.
Data warehouses may allow unstructured data but they are not optimized for it.
ACID Property
Sets of database operations have the ACID property if they have the following properties:
- All operations always successfully complete or as if all never attempted (atomicity).
- All beginning and ending database states are always valid (consistency).
- All operations never depend on other executing operations that are not in the set (isolation).
- All ending database states always survive system failures (durability).
Sets of database operations that have the ACID property are referred to as database transactions.
Kinematics & Dynamics
Kinematics is the subset of mechanics not involving forces and torques. Dynamics is the subset of mechanics involving forces and torques.
Electrostatics & Electrodynamics
Electrostatics is the study of unvarying charges, currents and electromagnetic fields. Electrodynamics is the study of varying charges, currents and electromagnetic fields.
Python Boolean Types
Python booleans are of type bool which is a subclass of type int which is a subclass of type object.
Lunar Cycles
The orbital period of the Moon is about 27.3 days. The phases of the Moon on Earth appear to have a period of about 29.5 days.