Inverse Days 2026

Inverse Days 2026

The Inverse Days conference is the annual scientific meeting of the Finnish Inverse Problems Society. It is also part of the activities of the Flagship of Advanced Mathematics for Sensing, Imaging and Modelling (FAME).

Dates: December 14–17, 2026
Venue: University of Jyväskylä Main Building C (Päärakennus), Seminaarinkatu 15, Jyväskylä FI – 40014

The University of Jyväskylä is located in a beautiful natural landscape, close to the centre of Jyväskylä. The university campus areas Seminaarinmäki, Mattilanniemi and Ylistö form a unique park-like complex that combines old and new.

To navigate the university’s campus, use navi.jyu.fi.

Important Dates

Registration, abstract submission and payments are now OPEN!

Deadline for registration, abstract submission and payment: November 14, 2026 23:59 Finnish time.

Event schedule

TBA

• Day 1
• Day 2
• Day 3
• Plenary speaker 1
• Plenary speaker 2
• Detailed timetable
• Book of abstracts

Monday, December 15th

10:00 Registration & coffee

10:30 Welcome

11:00 Plenary I: Tatiana Bubba (University of Ferrara)

12:00 Lunch break

13:30 Parallel sessions

15:10 Coffee

15:45 Parallel sessions

17:30 Icebreaker

19:00 FIPS Board Meeting & Young researchers’ event

Tuesday, December 16th

08:50 Parallel sessions

10:30 Coffee

11:00 Plenary II: Nicholas Nelsen (Cornell University)

12:00 Lunch break

13:30 Parallel sessions & AI session

15:10 Coffee & Women in Inverse Problems

16:00 Lightning talks

17:40 FIPS annual meeting

19:00 Conference dinner at Restaurant Bank (Unioninkatu 20)

Wednesday, December 17th

08:50 Parallel sessions

10:30 Coffee

11:00 Parallel sessions

12:15 Lunch break

13:30 Finnish Inverse Prize

13:45 Industry session

• 13:45 Alexander Meaney / Opening Words
• 13:50 – 14:10 Tuomo Kauranne / Arbonaut: Machine Learning as an Inverse Problem?
• 14:10 – 14:30 Antti Solonen / Danfoss: Mathematics of district heating: bridging producers and consumers
• 14:30 – 14:50 Çağlar Aytekin / Quanscient: MultiphysicsAI: Fast Surrogate Models for Large-Scale Inverse Problems
• 14:50 – 15:10 Lauri Parkkonen / Megin: Magnetoencephalography and the electromagnetic inverse problem in brain measurements
• 15:10 – 15:30 Mikko Lilja / Planmed: CBCT as an imaging method and its practical applications

15:30 Coffee

16:00 Parallel sessions

17:15 Closing

Monday, December 15th

Tatiana Bubba (University of Ferrara)

Tatiana Bubba is an Assistant Professor in Numerical Analysis at the Department of Mathematics and Computer Science of the University of Ferrara (Italy). After obtaining her PhD in 2016 from the University of Ferrara, Italy, she became postdoctoral researcher at the University of Helsinki, Finland, where she was Academy Postdoc from 2020. In 2021 she relocated to the UK, first with a Royal Society Newton International Fellowship at the University of Cambridge, and later on as a Lecturer at the University of Bath from 2022 before returning to the University of Ferrara in 2024. Her interest lies in computational inverse problems, especially in tomographic applications. Currently, her research revolves around combining sparse regularisation techniques based on multiresolution systems, with deep learning approaches.

Tuesday, December 16th

Nicholas Nelsen (Cornell University)

Nicholas Nelsen is a Klarman Fellow in the Department of Mathematics at Cornell University. In the fall of 2026, he will join The University of Texas at Austin as an Assistant Professor. Nelsen’s research centers on computational mathematics, machine learning, inverse problems, and uncertainty quantification. His fundamental work is motivated by applications in the physical, engineering, and data sciences. From 2024 to 2025, he was an NSF Postdoctoral Research Fellow in the Department of Mathematics at MIT. Nelsen earned his Ph.D. from Caltech in 2024, where his doctoral dissertation on operator learning was awarded the W. P. Carey & Co. Prize in Applied Mathematics and the Centennial Prize for the Best Thesis in MCE. His work was recognized with a SIGEST award from the Society for Industrial and Applied Mathematics in 2024.

Timetable_Inverse_Days_2025Download

Book_of_Abstracts_Inverse_Days_2025Download

Registration

Please register using this link. Please note that your registration is incomplete without the fee payment.

Payment

Registration fee:

Full registration fee (including conference dinner): 200 €

Registration fee (without conference dinner): 150 €

The deadline for registration and fee payment is Saturday, November 14th, 2026, 23:59 Finnish time.

How to pay:

Payments for the conference fee and dinner happen ONLY by direct transfer to the following banking coordinates: 

• Account owner: Suomen inversioseura
• IBAN: FI72 1012 3000 2079 18
• BIC: NDEAFIHH

Please use the reference numbers

• 211116 for individual payments
• 211213 for group payments

If you are paying on behalf of somebody else, or in case you are making a group payment, please contact us (inversedays2026@jyu.fi) and send us a receipt of payment, as well as the name(s) of the person(s) you are paying for. In case your bank does not allow reference numbers, please use the message field. Otherwise, contact us with a receipt of payment in order to let us know that you have made the transfer.

The deadline for payment is Saturday, November 14th, 2026, 23:59 Finnish time. Please make sure that your payment is made by this date, or your participation will be cancelled.

Abstract submission

Once you have registered, if you wish to give a talk, please submit your abstract using this link by the deadline.

Travel to Jyväskylä

The city of Jyväskylä is located in Central Finland, some 270 km north of Helsinki. The connections are relatively frequent and the journey from Helsinki to Jyväskylä takes 3,5 – 4 hours by train. Please note that trains and buses are more convenient and environmentally friendly ways to reach Jyväskylä than plane.

From Helsinki to Jyväskylä

There are frequent buses and trains, both from Helsinki airport and Helsinki Central Station to Jyväskylä.

The journey from Helsinki to Jyväskylä takes approximately 3.5—4 hours. Please check the train connections and purchase tickets on the VR (Finnish Railways) website.

To travel by bus, you can check timetables and purchase tickets on the websites of Matkahuolto, Onnibus or Flixbus.

Matkahuolto tickets and timetables

Onnibus tickets and timetables 

Flixbus tickets and timetables 

Flixbus, Onnibus and Matkahuolto buses leave from the Helsinki Vantaa Airport, and also from Helsinki city centre.

Travel within Jyväskylä

Jyväskylä region comprises of three sub-regions designated A, B and C. The purchase of bus tickets depends on the zone you wish to travel within. The university, city center and the hotels mentioned below are all located within zone A.

Linkki -buses provide local transport. Tickets can be paid for in cash to the driver or by contactless payment (Visa, Visa Electron, Master Card, Eurocard, or Google Pay/Apple Pay). You can download the Linkki application from the app store to your mobile device to find tickets and routes easily in the Jyväskylä region.

Accommodation

We have obtained discounted rates for the conference participants at the following hotels. Please click on the hotel to see the details.

Other hotel options near the venue include (tentative rates):

Time Hostel CITY (€150 / 3 nights)

Time Hostel NOVA (€150 / 3 nights)

Time Hotel (€220 / 3 nights)

Forenom Aparthotel Jyväskylä (10 % discount using code F10FQ)

Forenom Hostel Jyväskylä (10 % discount using code F10FQ)

Forenom Serviced Apartments Jyväskylä Vaasankatu (10 % discount using code F10FQ)

Young researchers’ event

The event is expected to take place on Wednesday 16^th of December from 19:00 to 22:00. Venue and further information will be announced soon.

With public transport, it takes approximately 25 to 30 minutes to travel from the University of Helsinki’s main building to the venue. Trips can be planned through the HSL website or with the HSL app. To find a route from the main building to the venue, for example, set Fabianinkatu 33 as the point of origin and Energiakatu 3 as the destination. An AB ticket is needed to travel from the City Centre to the venue.

Dinner is not included. Drinks and small snacks are available at the venue at attendee’s own expense.

During the event, attendees are free to take part in any of the available activities. The activities include bowling, darts, pool tables, archery, reaction and speed test games, table games, shooting simulator, etc. To take part in archery, please take extra care to follow instructions from the venue staff. We have nearly 150 registered attendees, so popular activities might be crowded at times.

Season’s must-see

Taste of Jyväskylä

The following establishments may be of interest to conference attendees.

Cafes and Restaurants on Seminaarinmäki Campus

Restaurant Taide and cafe Tiede

Restaurant Ilokivi

Restaurant LOZZI

Restaurant SYKE

Restaurant TILIA

Cafe Belvedere

You can use jybar.app.jyu.fi/lunch to look at the menus of the above.

Restaurants (Ravintola)

Cielo

Bistro 11

Fujia

Restaurant Villa Rana

Pizzeria Maria

Kebab House

Cafes

Bars

Code of conduct

We ask all participants at Inverse Days to adhere to the Finnish Inverse Problems Society Code of Conduct.
You can download the code of conduct document from the link below.

Contact

Local organising committee: Inverse problems group at the University of Jyväskylä
Inquiries: inversedays2026@jyu.fi

Site image: University of Jyväskylä