Specific Hints for Puzzle 2.1 (Crossword Puzzle)

A term in group theory = Distance traveled in a year by a planet.

A term in vector algebra = long and narrow (as a shape) + type of long sandwich + space

P(x)/Q(x)

A term in ring algebra: I=aR.

$ z \in \mathbb{C} $

A labeled structure in a poset.

$ sts = tst $, for example.

A dividing wall in a flying machine.

$ G \times X \to X, (g,x) \mapsto g \cdot x $

A set of cones whose union is the whole space.

Which language is this?

$ \mathbbm{1}_A: A \to \{0,1\} $

A dividing wall that doesn’t traverse.

See also this image.

Look up the name of the corresponding geological period.

A certain type of commutative ring.

A term in graph theory = a big vegetal thing that spreads out.

Also known as Gaussian elimination.