Table of Contents
| 1: Why Is Negative Number Multiplied by Negative Number Plus? |
| Just a definition by a mathematician? But there should be some good reasons for adopting the definition. |
| 2: Why Are Mirror Images Regarded to Be Congruent in Plane Geometry? |
| Just a definition by a mathematician? But there should be some good reasons for adopting the definition. |
| 3: What Are Discrete? What Are Continuous? |
| Water is not continuous, because it is made of molecules. Even if we ignore the fact, "Water is continuous." is mathematically nonsense. |
| 4: Are You Talking About Sets or About Collections? |
| Japanese schools talk about "shugo"s, but are they sets or collections? |
| 5: What Is a Vector? |
| "A quantity that has both size and direction"? But what is 'size' or 'direction'? In fact, any vector is an element of a vectors space, which is not any tautology. |
| 6: Imaginary Numbers Are as Real as Real Numbers |
| , while real numbers are as imaginary as imaginary numbers |
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