I am making electronic slides for a presentation, and sometimes Russian words are too long to easily fit, so I'd like to use some abbreviations. From seeing lectures at blank boards, I've seen things like ф-я for функция, Д-во for доказательство, and ст-рa for структура.
When I showed a sample of my slides to a native speaker, she thought удов-яют for удовлетворяют, built on the pattern of the previous examples, looked weird and that удов. looked more natural. She thought maybe there is some preference to abbreviate a verb just using initial letters and a noun or adj. using initial and final letters, although she hasn't really done this herself in making slides (and this idea is not always followed, e.g., Теор. for Теорема instead of Теор-а). My basic request is for advice about how to write natural-looking abbreviations of long Russian words.