This project uses some concept that will be detailed here.

There is no square. A rectangle is a polygon (quadrilateral with a length and a width).

If you add points, coordinates then it is a cartesianRectangle.

Those simple rectangle can't really be compare, however you can compare there area or perimeter.

For not conditional probabilities.

Standard would be:

P(A and B) = P(A) * P(B)

Standard would be:

P(A or B) = P(A) + P(B) - P(A and B)

Morgan's law would be to look at neither A and B to get A or B:

P(A or B) = not P(not A) and P(not B)

Quantity - Analysis pattern by Martin Fowler

Type of Unit

• Nominal (distance, volume)
• Ordinal (scale-like representing a rank)
• IntervalQuantity (dates, temperature)
• Ratio (days)