Online Worldwide Seminar on

Logic and Semantics (OWLS)

The seminar has shifted later by 1 hour, and now starts at 2pm UTC



The Online Worldwide Seminar on Logic and Semantics is a new series of research talks, highlighting the most exciting recent work in the international computer science logic community. The scope of the seminar series is roughly that of the major computer science logic conferences such as LICS, ICALP and FSCD. It takes place on most Wednesdays, with a focus every other week on the work of young researchers.

In this time of restricted international travel, a key aim of this series is to provide a forum for the informal discussion and social interaction that is so important for the progress of science. To facilitate this, the seminar incorporates in virtual form a number of features more normally associated with physical meetings:

Talks are given by invitation of the organizing committee. Feedback is warmly encouraged; if you have any comments or ideas, feel free to get in touch with an organizer.

Mailing list

The OWLS mailing list sends reminders before each seminar, and announces upcoming seminars. To subscribe, or manage an existing subscription, visit this link:

Messages will be sent from the address


Time change: seminars now take place on Wednesdays at 3pm in the UK, which is 2pm UTC. An easy way to see the corresponding time in your own time zone is to add the OWLS calendar to your own calendar, with the following links: Google Calendar Apple Calendar

Seminars are 45 minutes long including questions, and will start at the advertised time. As described below, feel free to join early, or stay around after the end of the talk, to participate in the coffee breaks. A link to join the seminar is given in the participant information below. Every other week, the seminar hosts a young researcher to present their work; these seminars are labelled OWLS-YR.

Here is the list of upcoming seminars.

Here is the list of past seminars in reverse chronological order.

Information for participants

Joining the seminar. To join any OWLS seminar, visit the following link, up to 15 minutes before the posted start time:

You will be given the option to join through your web browser, or to launch the Zoom client if it is installed on your device (see below). For the best experience, we recommend using the client. When prompted for your name, please enter your real name, so that social interactions during the seminar and coffee breaks can be more natural.

Audio and video. We encourage all participants to enable their audio and video at all times (click "Use Device Audio" in the Zoom interface.) Don't worry about making noise and disrupting the proceedings accidentally; the Chairperson will ensure your audio is muted by default during the seminar. Having your audio and video enabled will allow other participants to see your face in the "Gallery" view, letting them know that you're taking part. It also gives you the option of asking a question, and of making best use of the "coffee break" sessions. For most users with good network access (such as a fast home broadband connection), there is no need to worry that having your audio and video enabled will degrade the experience; the technology platform ensures that the speaker's audio/video stream is prioritised at all times. However, those on slow connections may find it better to disable their audio and video.

Coffee breaks. Every OWLS seminar has two "coffee breaks", one starting 15 minutes before the posted start time of the seminar, and the second starting after the seminar is finished. To participate in these, feel free to join the meeting early, or to keep the meeting window open after the end of the talk. During these coffee break periods, participants will be automatically gathered into small groups, assigned at random; please introduce yourself to the other members of your group, and chat just like you would at a real conference. Remember to bring your own coffee! If you're not interested in chatting, please close the meeting window during the coffee break periods, so that people who want to chat are not grouped with those who do not.

During the seminar. If you'd like to ask a question, either during the seminar or in the question period at the end, click the "Participants" menu and select "Raise hand". The Chairperson may choose to interrupt the speaker and give your audio/video feed the focus, giving you the opportunity to ask your question verbally, or may instead decide to let the seminar continue. You may click "Lower hand" at any time to show you no longer wish to ask a question. To preserve the experience of a real face-to-face conference, there is no possibility of giving a written question, and the chat room is disabled. You also have the opportunity to give nonverbal feedback to the speaker by clicking the "speed up" or "slow down" buttons, also in the "Participants" menu.

Recordings. Most OWLS seminars will be recorded and uploaded to YouTube after the event. Only the audio/video of the chairperson, speaker, and questioners will be captured. If you prefer not to be recorded, do not ask a question. Of course, the organizers do not make any recordings of the coffee break sessions.

Inappropriate behaviour. The organizers make use of a range of security features to ensure that the seminar cannot be disrupted by participants who are not interested in constructive scientific interaction. During a seminar, if you observe ongoing inappropriate behaviour, please send a private message to the chairperson to point it out.

Technology platform

Seminars are hosted through the video conferencing system Zoom. Native clients are available to download for a wide range of platforms, including mobile devices:

For those who prefer not to use a client, a browser interface is also available.

Organizing committees

If you have any feedback about OWLS, feel free to get in touch with an organizer.