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dpo merged 2 commits into from
Jan 26, 2026
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Update descriptions for BFGS and SR1 operators #216

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f703c06
Update descriptions for BFGS and SR1 operators
MaxenceGollier Jan 23, 2026
a328577
Update SR1 operator inverse form explanation
MaxenceGollier Jan 23, 2026
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7 changes: 5 additions & 2 deletions tutorials/introduction-to-linear-operators/index.md
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Expand Up @@ -326,7 +326,7 @@ norm(b - opAAT * x)

## Limited memory BFGS and SR1

Two other useful operators are the Limited-Memory BFGS in forward and inverse form.
Another useful operator is the Limited-Memory BFGS in forward and inverse form.

```julia
B = LBFGSOperator(20)
Expand All @@ -351,7 +351,10 @@ r



There is also a LSR1 operator that behaves similarly to these two.
There is also a Limited-Memory SR1 operator for which only the forward form is implemented.
Note that the SR1 operator can be indefinite; therefore, its inverse form is less relevant than for the BFGS approximation.
For this reason, the inverse form is not implemented for the SR1 operator.


## Restriction, extension and slices

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