---
date: 2022-04-03 19:11
modification date: Sunday 3rd April 2022 19:11:48
title: "Gysin sequence"
aliases: [Gysin sequence, edge morphism, Gysin, Integration along the fiber, projection formula]

---

Last modified date: <%+ tp.file.last_modified_date() %>


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- Tags 
	- #spectral-sequences 
- Refs:
	- #todo/add-references
- Links:
	- #todo/create-links 

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# Gysin sequence

Gysin maps are [wrong-way maps](wrong-way%20maps).

![](attachments/Pasted%20image%2020220422205310.png)

![](attachments/Pasted%20image%2020220403191150.png)
![](attachments/Pasted%20image%2020220403191159.png)
![](attachments/Pasted%20image%2020220403191210.png)

# Integration along the fiber

An example of [wrong-way maps](wrong-way%20maps):

![](attachments/Pasted%20image%2020220403195414.png)
 
# Examples


#examples/explicit-computations

![](attachments/Pasted%20image%2020220403191225.png)