Notes on [Schubert varieties](Unsorted/Schubert.md).

The Virasoro algebra, used in [conformal field theory](conformal%20field%20theory) and [string theory](Unsorted/string%20theory.md)
![Pasted image 20211205021938.png](Pasted%20image%2020211205021938.png)

![Pasted image 20211206010557.png](Pasted%20image%2020211206010557.png)

The nil-Hecke algebra:

![Pasted image 20211206010649.png](Pasted%20image%2020211206010649.png)

![Pasted image 20211206010812.png](Pasted%20image%2020211206010812.png)

![Pasted image 20211206011059.png](Pasted%20image%2020211206011059.png)

![Pasted image 20211206011709.png](Pasted%20image%2020211206011709.png)

![Pasted image 20211206011722.png](Pasted%20image%2020211206011722.png)

![Pasted image 20211206011750.png](Pasted%20image%2020211206011750.png)

![Pasted image 20211206012051.png](Pasted%20image%2020211206012051.png)

![Pasted image 20211206012215.png](Pasted%20image%2020211206012215.png)

![Pasted image 20211206012307.png](Pasted%20image%2020211206012307.png)

![Pasted image 20211206012323.png](Pasted%20image%2020211206012323.png)

![Pasted image 20211206012606.png](Pasted%20image%2020211206012606.png)

![Pasted image 20211206012617.png](Pasted%20image%2020211206012617.png)

![Pasted image 20211206012706.png](Pasted%20image%2020211206012706.png)

![Pasted image 20211206012733.png](Pasted%20image%2020211206012733.png)

![Pasted image 20211206012741.png](Pasted%20image%2020211206012741.png)

![Pasted image 20211206012810.png](Pasted%20image%2020211206012810.png)

![Pasted image 20211206014057.png](Pasted%20image%2020211206014057.png)

![Pasted image 20211206014108.png](Pasted%20image%2020211206014108.png)

![Pasted image 20211206014206.png](Pasted%20image%2020211206014206.png)

![Pasted image 20211206014222.png](Pasted%20image%2020211206014222.png)

See [klt](Unsorted/klt.md) singularities and [rational singularities](rational%20singularities)
![Pasted image 20211206014345.png](Pasted%20image%2020211206014345.png)