Activity for Tortilla
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #289760 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289760 |
Post edited: |
— | 8 months ago |
| Edit | Post #289758 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289758 |
Post edited: |
— | 8 months ago |
| Edit | Post #289757 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289757 |
Post edited: |
— | 8 months ago |
| Edit | Post #289760 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289760 |
Post edited: |
— | 8 months ago |
| Edit | Post #289760 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289760 |
Post edited: |
— | 8 months ago |
| Edit | Post #289760 | Initial revision | — | 8 months ago |
| Question | — |
While pictorializing $|x - y| < |x + y|$, how can 1 picture simultaneously prove (Reverse) △ Inequalities, $|x-y| ≤ |x|+|y|, |x|-|y| ≤ |x-y|$? I shall improve this post, because - it overlooked Triangle Inequality, $|x + y| ≤ \color{darkgoldenrod}{|x| + |y|}$. Michael Spivak's Calculus (2008 4 edn) proved it on p. 12. - a distinctive diagram ought spotlight, and stress, that $|x - y|$ CAN $(iv) ${\color{red}{|x-y|}} ≤ \color{goldenr... (more) |
— | 8 months ago |
| Edit | Post #289757 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289757 |
Post edited: |
— | 8 months ago |
| Edit | Post #289757 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289757 |
Post edited: |
— | 8 months ago |
| Edit | Post #289758 | Initial revision | — | 8 months ago |
| Question | — |
How can I improve contrast of red and green, to prove Reverse Triangle Inequality? I need to improve this original diagram to the one beneath, because this diagram reappears on standardized tests with different letters, orientation, position of the vectors. Tests require students to distinguish and label $\color{limegreen}{|\vec{b}| - |\vec{r}|}$ versus $\color{red}{\vec{b} - \vec... (more) |
— | 8 months ago |
| Edit | Post #289757 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289757 |
Post edited: |
— | 8 months ago |
| Edit | Post #289757 |
History hidden: Detailed history before this event is hidden because of a redaction. |
— | 8 months ago |
| Edit | Post #289757 |
Post edited: |
— | 8 months ago |
| Edit | Post #289757 | Initial revision | — | 8 months ago |
| Question | — |
Solely by eye, how can 16 year olds visually distinguish $\color{red}{\vec{b} - \vec{r}}$ from $\color{limegreen}{|\vec{b}| - |\vec{r}|}$ ? Yearly, I teach 16 year olds the diagram beneath (improvement of this original) that reappears on standardized tests with different letters, orientation, position of the vectors. Tests require students to distinguish and label $\color{red}{\vec{b} - \vec{r}}$ vs. $\color{limegreen}{|\vec{b}| - |\vec... (more) |
— | 8 months ago |