My kdb+ User Meeting Presentation

Here are the slides from the presentation I gave today at the kdb+ user meeting at BAML, in keynote, pdf, and powerpoint formats:

• (dis)functional select and de-queueing bugs.key
• (dis)functional select and de-queueing bugs.pdf
• (dis)functional select and de-queueing bugs.ppt

UPDATE: and here's the code as a loadable .q file:

• pres.q

Riddle 1: (all x)and not any x

When will {(all x)and not any x} return true (1b)?