Similar to 射影的対象
5項補題
Five lemma9項補題
Nine lemmaAB5 圏
AB5 categoryInvariant basis number
Invariant basis numberTor関手
Tor functorアスコリ=アルツェラの定理
Arzelà–Ascoli theorem始対象と終対象
Initial and terminal objectsHorseshoe lemma
Horseshoe lemma0
01
1▼-10 trends2
23
34
45
56
67
78
89
912345679
数学
Mathematics▼-1 trends0.999...
0.999...▲1 trends0次元
Zero-dimensional space0の0乗
Zero to the power of zero1次元
One-dimensional space1+1
1+1+1+1+…
1 + 1 + 1 + 1 + ⋯1+2+3+4+…
1 + 2 + 3 + 4 + ⋯1+2+4+8+…
1 + 2 + 4 + 8 + ⋯