Number/Quantity

Construction of subjects What is 'Number' ? What is 'Number' ? Position-Quantity-Number Ontology of "Number/Quantity" Natural Number Number of Objects Structure Sequence Law of Compo- sition Sum, Addition Difference Product Quotient Zero Rational Number Rational Multiple Law of Compo- sition Sum, Addition Product, Multiplication Quotient Extension of Natural Number Decimal Expression

"Sym- metrical  Number" Meaning Sign, Absolute value Law of Composition Order relation Line number Place of "Symmetrical Number" Real Number Need for Real Number Irrational number Completeness Square root Complex Number Why to learn Complex multiple Expression of complex number Law of Compo- sition Sum, Addition Product, Multiplication Extension of Real Number Gaussian Plane

Proportional Relation Meaning Problem solving Proportional Relation between numbers Measurement/ Calculation of Quantity General Discussion Itemized Discussion Length Area Volume Rotation Angle Velocity Generarlization to "Linear Algebra" Instruction of "Number/Quality" An Investigation on the Theme of "Number/Quantity" (advanced lecture)