Logopolitan

The Logopolitans were a race of humanoid mathematicians from the planet Logopolis. They were well known for their ability to do Block Transfer Computations in their minds.

Biology
Logopolitans looked like humans with grey hair and enlarged craniums. (DW: Logopolis)

Culture
Logopolitans wore flowing black and yellow robes. They lived in simple dwellings on Logopolis, working on math problems relayed to them by the Monitor. The workers sat at either a desk of computers or in carved inlets in rock faces while they worked out calculations. Tegan Jovanka compared this to a sweatshop. (DW: Logopolis)

History
Historically, the Logopolitans only used machines for simple tasks and very rarely had any need for technology; every Logopolitan worked on their section of an equation with an abacus. (DW: Logopolis) They were the first to develop Block Transfer Computations. (NA: Cat's Cradle: Witch Mark)

At some point before the 20th century the Logopolitans discovered that the Universe had already reached its point of collapse due to the advance of entropy. To maintain a continued existence, they built CVEs, which opened up the universe, N-Space, into a smaller one, E-Space,(Galifrey being near a CVE) moving the entropy into the other universe. The Logopolitans, through their Block Transfer Computations, were able to copy the Pharos Project on Earth and use it to relay computations to the CVEs. This preserved the universe while they tried to find a more permanent solution.

In 1981, the Master arrived on Logopolis and killed several Logopolitans. As a result the structure of the planet unravelled and Logopolis was silenced forever. The constant calculations for the CVEs were stopped and entropy built up, killing off the entire Logopolitan race as well as many other planets and races Including  Nyssa's home plant of Traken. (DW: Logopolis)