Math-Wiki - שינויים אחרונים [he]

Math-Wiki - שינויים אחרונים [he] https://math-wiki.com/index.php/%D7%9E%D7%99%D7%95%D7%97%D7%93:%D7%A9%D7%99%D7%A0%D7%95%D7%99%D7%99%D7%9D_%D7%90%D7%97%D7%A8%D7%95%D7%A0%D7%99%D7%9D ניתן לעקוב אחרי השינויים האחרונים באתר בהזנה זו. he MediaWiki 1.39.4 Tue, 12 May 2026 22:22:32 GMT Algebra seminar plan https://math-wiki.com/index.php?title=Algebra_seminar_plan&diff=90756&oldid=90754 https://math-wiki.com/index.php?title=Algebra_seminar_plan&diff=90756&oldid=90754 <p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="he"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">→ הגרסה הקודמת</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">גרסה מ־06:52, 10 במאי 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l33">שורה 33:</td> <td colspan="2" class="diff-lineno">שורה 33:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 27/5 - Gregory Mashevitsky</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 27/5 - Gregory Mashevitsky</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 3/6 - Yair Glasner</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 3/6 - Yair Glasner</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* 10/6 - </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* 10/6 - <ins style="font-weight: bold; text-decoration: none;">Dmitry Mineyev</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 17/6 - Ariel Yadin</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 17/6 - Ariel Yadin</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 24/6 -</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* 24/6 -</div></td></tr> </table> Sun, 10 May 2026 06:52:50 GMT Mschein https://math-wiki.com/index.php/%D7%A9%D7%99%D7%97%D7%94:Algebra_seminar_plan מבנים אלגבריים למדעי המחשב - ארז שיינר https://math-wiki.com/index.php?title=%D7%9E%D7%91%D7%A0%D7%99%D7%9D_%D7%90%D7%9C%D7%92%D7%91%D7%A8%D7%99%D7%99%D7%9D_%D7%9C%D7%9E%D7%93%D7%A2%D7%99_%D7%94%D7%9E%D7%97%D7%A9%D7%91_-_%D7%90%D7%A8%D7%96_%D7%A9%D7%99%D7%99%D7%A0%D7%A8&diff=90755&oldid=90747 https://math-wiki.com/index.php?title=%D7%9E%D7%91%D7%A0%D7%99%D7%9D_%D7%90%D7%9C%D7%92%D7%91%D7%A8%D7%99%D7%99%D7%9D_%D7%9C%D7%9E%D7%93%D7%A2%D7%99_%D7%94%D7%9E%D7%97%D7%A9%D7%91_-_%D7%90%D7%A8%D7%96_%D7%A9%D7%99%D7%99%D7%A0%D7%A8&diff=90755&oldid=90747 <p><span dir="auto"><span class="autocomment">הרצאה 4 הומומורפיזמים, איזומורפיזמים, משפט קיילי, משפט לגראנג'; פרקים 9 ו6 מהספר</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="he"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">→ הגרסה הקודמת</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">גרסה מ־07:52, 7 במאי 2026</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l246">שורה 246:</td> <td colspan="2" class="diff-lineno">שורה 246:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***לכן <math>f(a^n)=\left(f(a)\right)^n=e_H</math>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***לכן <math>f(a^n)=\left(f(a)\right)^n=e_H</math>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***לכן <math>o(f(a))\leq n=o(a)</math>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***לכן <math>o(f(a))\leq n=o(a)</math>.</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">**אם f איזומורפיזם אזי גם <math>f^{-1}</math> איזומורפיזם</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>**אם f איזומורפיזם אזי <math>o(f(a))= o(a)</math>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>**אם f איזומורפיזם אזי <math>o(f(a))= o(a)</math>.</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>***<del style="font-weight: bold; text-decoration: none;">נניח כי <math>o(a)=n</math>, הוכחנו ש</del><math>o(f(a))\leq <del style="font-weight: bold; text-decoration: none;">n</del></math><del style="font-weight: bold; text-decoration: none;">.</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>***<math>o(f(a))\leq <ins style="font-weight: bold; text-decoration: none;">o(a)</ins></math></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>***<del style="font-weight: bold; text-decoration: none;">נסמן </del><math>o<del style="font-weight: bold; text-decoration: none;">(f</del>(a<del style="font-weight: bold; text-decoration: none;">)</del>)=<del style="font-weight: bold; text-decoration: none;">k</math>.</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>***<math>o(a)= <ins style="font-weight: bold; text-decoration: none;">o</ins>(f<ins style="font-weight: bold; text-decoration: none;">^{-1}</ins>(f(a)<ins style="font-weight: bold; text-decoration: none;">)</ins>)\leq o(f(a))</math></div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">***לכן <math>\left</del>(f(<del style="font-weight: bold; text-decoration: none;">a)\right)^k=e_H</math>, ולכן <math></del>f(a<del style="font-weight: bold; text-decoration: none;">^k</del>)<del style="font-weight: bold; text-decoration: none;">=e_H</math>.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">***כיוון שאיזומורפיזם הינו פונקציה חח"ע, נובע כי <math>a^k=e_G</math>, כלומר <math>o(a</del>)\leq <del style="font-weight: bold; text-decoration: none;">k</math>.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">***ביחד <math>k=n</math>.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">***לבסוף, נובע <math></del>o(f(a))</math> <del style="font-weight: bold; text-decoration: none;">סופי אם"ם <math>o(a)</math> סופי, ולכן הם שווים גם אם אחד מהם הוא אינסוף.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>**אם f הומומורפיזם אזי <math>f(a^{-1})=\left(f(a)\right)^{-1}</math> (שימו לב שf לא צריכה להיות הפיכה, והסימון <math>f^{-1}(a)</math> לא בהכרח מוגדר ואינו קשור).</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>**אם f הומומורפיזם אזי <math>f(a^{-1})=\left(f(a)\right)^{-1}</math> (שימו לב שf לא צריכה להיות הפיכה, והסימון <math>f^{-1}(a)</math> לא בהכרח מוגדר ואינו קשור).</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***אכן <math>f(a)\cdot f(a^{-1})=f(e_G)=e_H</math>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>***אכן <math>f(a)\cdot f(a^{-1})=f(e_G)=e_H</math>.</div></td></tr> </table> Thu, 07 May 2026 07:52:06 GMT ארז שיינר https://math-wiki.com/index.php/%D7%A9%D7%99%D7%97%D7%94:%D7%9E%D7%91%D7%A0%D7%99%D7%9D_%D7%90%D7%9C%D7%92%D7%91%D7%A8%D7%99%D7%99%D7%9D_%D7%9C%D7%9E%D7%93%D7%A2%D7%99_%D7%94%D7%9E%D7%97%D7%A9%D7%91_-_%D7%90%D7%A8%D7%96_%D7%A9%D7%99%D7%99%D7%A0%D7%A8