Inverse Days 2025

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

Dates: December 15–17, 2025
Venue: University of Helsinki Main Building, Fabianinkatu 33, 00170 Helsinki

Tentative schedule

To be updated.

Registration (deadline: November 7th, 2025)

Registration fee: 250€, includes dinner at Restaurant Bank on December 16th and the young researchers event on December 15th.

Deadline for the registration form and registration fee is on Friday, November 7th, 2025.

How to pay:

Payment must be done via bank transfer only. Deadline is November 7th. 

Registration fee transfers should be made to the account of the Finnish Inverse Problems Society:

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

Use the appropriate reference number below when making a payment.

• 211116 : Individual payment
• 211213 : Group payment (send additional email to organizers (inverse-days@helsinki.fi) with a transfer receipt and a list of names)

Abstract submission

Please send abstract to inverse-days@helsinki.fi by November 21st.

Travel information

From the airport

Helsinki Airport locates 20 km from Helsinki City Centre, from where it takes around 30 minutes by car or the train to reach the airport.

Helsinki Airport’s bus station is located outside the Arrivals hall. The bus route 600 operates between Helsinki Airport and Helsinki City Centre with a travel time of about 40 minutes.

Bus fares and train tickets can be paid by contactless payment inside the mode of transport or with the HSL app/HSL travel card. You will need the “ABC” ticket from the airport to the City Centre. Trips can be planned through the HSL website or with the app.

The taxi station can also be found outside the Arrivals hall. There are four taxi lanes and four taxi companies to choose from. The fares for each are indicated on the taxi station.

From the Helsinki Central Railway Station

The Helsinki Central Railway Station is the city’s main transportation hub for trains, buses, and metro.

The University of Helsinki’s Main Building is located at the heart of City Centre with a walking distance of about 10 minutes from the station. The direct metro line from the station to the “University of Helsinki” metro stop takes only 1 minute. Taxis can also be found near each main exit.

Accomodation

Inverse Days participants can get a discounted daily rate at the following hotels.

1. Töölö Towers: use the promotion code “Inverse25” while booking from Unihome’s website.

Room rate: 73€ per night for single room and 103€ per night for double room for any night from 12.12. to 19.12.

2. Solo Sokos Hotel Helsinki or Original Sokos Hotel Vaakuna with the reservation code “WORKERY“.

Room rate: 5% discount on the best available daily rate for nights 15.12. to 17.12.

All room bookings are based on availability and may close when all available rooms are booked, so please book ahead of time.

All room rates include breakfast. 

Other hotel options near the venue include:
Marski by Scandic
Scandic Grand Central Helsinki
Radisson Blu Plaza Hotel
Hotel Arthur

Important Dates

Registration ends: November 7th 2025

Deadline for abstract submission: November 21st 2025

(all dates by midnight EET)

Contact

Local organising committee: Alexander Meaney, Chuyang Wu, Eetu Halme, Hewan Zewde, Hjørdis Schlüter, Markus Juvonen, Marvin Knöller, Medet Nursultanov, Meri Laurikainen, Petri Ola, Saara Malila, Salla Latva-Äijö, Sara Sippola, Siiri Rautio, and Zhiao Zhang.
Inquiries: inverse-days@helsinki.fi

Season’s must-see

The University of Helsinki Main Building resides on the western side of Senate Square, the city’s historical centre point, facing both the Governmental Palace and Helsinki Cathedral. From November 28th to December 22nd, the Senate Square hosts the annual Helsinki Christmas Market. The market is a perfect place to browse unique gifts, try traditional Christmast flavours at the food court, or just take in the season’s atmosphere at your own pace.

Taste of Helsinki

The following establishments may be of interest to conference attendees.

Restaurants

Kosmos – Classical Finnish and European cuisine since 1924

Kappeli – Finnish ingredients in one of Helsinki’s most traditional meeting places

Restaurant Savotta – “Logging site” in Finnish, Savotta serves traditional Finnish foods next to the Senate Square

10. Kerros – “The 10th floor”, one of the best views over the city

Pizzeria Via Tribunali Centrum – Authentic Neapolitan pizza in Finland’s only certified Neapolitan pizzeria

Cafes

Fazer Café Kluuvikatu 3 – Where it all began for Fazer in 1891

Robert’s Coffee Jugend – An urban living room in a former Art Nouveau-style banking hall

Café Esplanad – Locally roasted coffee beans in a classical Parisian-style setting near the Esplanad Park

Café Engel – Located on the edge of Senate Square in one of the oldest stone houses in Helsinki

Ekberg – Finland’s oldest bakery, patisserie, and café

Bars

Olutravintola Pikkulintu – Specialises in Scottish malt whiskys

Teerenpeli – Beers, ciders, long drinks, and award-winning whiskys and gins of their own production

Molly Malone’s – One of the top 50 Irish Pubs in Europe

Thirsty Scholar – Popular meeting place of students in the middle of the University of Helsinki’s City Centre campus

Bierhaus München – Too many beers to count

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.

Site image: Tori Quarter & Jussi Hellsten