WIP How to define Unitals

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Purpose of this Wiki

This is a wiki to note a new way to think about symbol Concepts to be used in these SRS documents. This is to help with a number of current issues with capturing and rendering the knowledge. See #91 or #265 for example.

Capturing Knowledge

We create three groups to capture concepts.

Three Groups

Physical Properties

Examples:

• Force
• Weight
• Length
• Number
• Probability
• Factor
• Time

Physical Object or Events

Examples:

• Water
• Ball
• Tank
• Breakage
• Throw

Auxiliaries

This is for concepts that cannot fit in the other two categories. Examples:

• Coordinates such as x, y, (x,y,z), (i,j,k)
• (Arbitrary) Constants, functions, variables, or parameters such as y=mx + b, find x(t) where mx''=-kx
• Misc ? such as gradient operator ∇

Putting them together

Idea property pair

Take a property and combine it with an object or event to create a UnitalChunk. Examples;

• Water weight
• Number of slices
• Probability of failure

Auxiliary Entities

Auxiliaries can become a UnitalChunk on their own.

Modifiers

These can be added to a UnitalChunk to create a new UnitalChunk. Examples;

• initial / final
• normal / shear
• angular
• difference (think change in temperature or Δx)
• ratio
• vector
• unit (as in unit vector)

Examples of use and ideal implementation

We can take Temperature and combine it with Water and modify it with Final. Give temperature the symbol T. Then add the subscript W for water to get T_W. Then add a second subscript or superscript for final to get T^f_W.