A blackboard filled with handwritten equations and diagrams.
Palabras clave
blackboard,
mathematic,
diagram,
science,
education,
lesson,
classroom,
school,
learning,
formula,
white,
black,
background,
cognition,
concept,
academic,
study,
university,
student,
abstract,
graphic,
pattern,
design,
geometry,
symbol,
texture,
surface,
scribble,
doodle,
equation,
mathematic,
blackboard,
board,
algebra,
vector,
calculation,
chalk,
learn,
graph,
illustration,
mathematical,
college,
solution,
number,
drawing,
vignetting,
physics
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