1. doppler friends

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recurrent :: transient
platonic symmetry :: heraclitan flux
x --> known space :: known space --> x
coincidence :: contingency
internal :: external
content :: context
equilibrium :: cycle
constants :: variables
ex ante :: post facto
result :: validation
done :: to-do
input :: output
past :: future
before :: after
elapsed :: e.t.a
explain :: forecast
afferent :: efferent
action :: perception
systole :: diastole
inhale :: exhale
tonic :: phasic
lead :: follow
pump :: burn
source :: sink
floor :: ceiling
produce :: consume
buy long :: sell short
receivable :: payable
discounted :: compounded
top down :: bottom up
disjoint :: conjoint
needle :: haystack
digital :: analog
particle :: wave
split :: merge
read :: write
call :: put
stack :: queue
between :: among
offense :: defense
affirm :: backpedal
sensitivity :: specificity
keith david :: david keith

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2. cat adjunctions

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object :: arrow
domain :: codomain
state :: transition
system :: process
solution :: constraint
existence :: uniqueness
series :: parallel
closed :: open
preserve :: reflect
coarsest :: finest
subset :: partition
equivalent :: isomorphic
concrete :: universal
theorem :: proof
if :: only if
initial :: final
set :: cat
{} :: {0}
{1} :: {0,1}
1-to-1 :: onto
monic :: epic
faithful :: full
0+1 :: 0x1
injective hull :: projective cover
controllable :: observable
0-->gb :: f0-->b
c-->axb :: c-->a,c-->b
c-->b^a :: cxa-->b
node deletion :: edge contraction
delaunay triangulation :: voronoi tessellation
convex hull of points and rays :: intersection of halfspaces
max-flow :: min-cut
dilation :: erosion
sine :: impulse
matrix :: transpose
discrete :: continuous

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3. "abstract nonsense"

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