Repository of problems worth solving
World Solve is a public institutional repository for identifying real unresolved problems across science, society, health, governance, economics, and local systems. Each entry is intended to be citable, inspectable, and actionable.
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4194Total
4194Open
0Solved
9Humans
open
Global / Unspecified, Global
Gödel's theorems already limit what's possible here for sufficiently powerful systems, but the full landscape of alternative systems and their limitations remains an active and unresolved area of mathematical logic. This continues to shape our understanding of the foundations of mathematics itself.
mathematics-logic
global-unspecified
possible
mathematical
haven
determined
whether
build
truly
complete
consistent
system
philosophy-ethics
resolved
know
every
open
Global / Unspecified, Global
Certain classes of expressions can be checked for equivalence efficiently, but a fully general and guaranteed method covering every possible mathematical expression remains unresolved. This unresolved question has real consequences for automated theorem proving and symbolic computation.
mathematics-logic
global-unspecified
whether
possible
mathematical
expressions
haven
proven
always
determine
only
finite
philosophy-ethics
resolved
know
every
open
Global / Unspecified, Global
Some cellular automata, like simple grid-based rule systems, produce behavior so complex that no shortcut prediction method has been proven to exist beyond simply running the simulation. This unresolved question touches on computational irreducibility and the philosophy of prediction.
philosophy-ethics
global-unspecified
complex
cellular
shortcut
haven
determined
whether
possible
perfectly
predict
outcome
know
mathematics-logic
resolved
every
mathematical
open
Global / Unspecified, Global
Dissection problems, which ask how shapes can be cut and rearranged, often lack complete general solutions beyond specific well-studied cases. This remains an open and often surprisingly difficult area of combinatorial geometry.
mathematics-logic
global-unspecified
general
haven
proven
whether
there
method
determining
exact
number
ways
philosophy-ethics
know
possible
resolved
every
mathematical
open
Global / Unspecified, Global
Some deterministic functions produce output so irregular it resembles randomness, and a complete classification of exactly which rules produce this behavior remains incomplete. This unresolved boundary connects number theory, chaos theory, and computer science.
mathematics-logic
global-unspecified
deterministic
don
know
whether
possible
fully
characterize
every
mathematical
function
haven
philosophy-ethics
resolved
open
Global / Unspecified, Global
Games involving bluffing or incomplete knowledge, like certain card games, resist the same clean mathematical solutions available for games of complete information. This unresolved question remains central to advanced game theory research.
mathematics-logic
global-unspecified
game
information
hidden
games
haven
determined
whether
every
possible
strategy
philosophy-ethics
resolved
know
mathematical
open
Global / Unspecified, Global
Reconstruction problems in geometry ask how much partial information is truly enough to rebuild a full shape with certainty, and general limits for all shape classes remain incompletely understood. This connects pure mathematics to practical fields like imaging and tomography.
mathematics-logic
global-unspecified
shape
haven
determined
whether
every
finite
geometric
always
perfectly
reconstructed
know
resolved
possible
philosophy-ethics
mathematical
open
Global / Unspecified, Global
Self-referential paradoxes have challenged logicians for over a century, and while specific paradoxes have been addressed with targeted fixes, no single unified framework has resolved every possible version. This unresolved tension remains central to the foundations of mathematical logic.
mathematics-logic
global-unspecified
resolved
every
possible
haven
whether
logical
paradox
fully
neutralized
some
philosophy-ethics
know
determine
open
Global / Unspecified, Global
While many algebraic structures have been classified, some corners of abstract algebra still lack a fully confirmed and complete classification of their most basic components. This ongoing effort shapes the foundations of modern algebraic research.
mathematics-logic
global-unspecified
fully
complete
algebra
haven
determined
whether
possible
construct
list
every
philosophy-ethics
resolved
know
mathematical
open
Global / Unspecified, Global
Symmetry classification has succeeded for many specific structures, but a fully complete and general classification covering every conceivable symmetric object remains an ongoing and unresolved mathematical project. This shapes foundational research in group theory and geometry.
mathematics-logic
global-unspecified
possible
fully
every
mathematical
object
remains
haven
determined
whether
characterize
philosophy-ethics
resolved
know
open
Global / Unspecified, Global
The three-body problem famously resists the same clean, closed-form solutions available for two-body systems, and general long-term predictability for all such systems remains incompletely understood. This unresolved question connects pure mathematics directly to astrophysics.
mathematics-logic
global-unspecified
long-term
don
know
whether
possible
fully
predict
stability
any
mathematical
systems
philosophy-ethics
resolved
haven
society-governance
open
Global / Unspecified, Global
Self-referential systems often run into paradoxes, and while specific fixes exist for particular cases, no fully general and complete solution has been proven for every possible self-describing system. This unresolved tension remains central to mathematical logic and computer science.
mathematics-logic
global-unspecified
every
mathematical
fully
haven
determined
whether
sufficiently
complex
language
unambiguously
philosophy-ethics
resolved
possible
know
open
Global / Unspecified, Global
Self-verifying proofs raise deep questions tied to Gödel's incompleteness results, and whether any sufficiently powerful system can ever fully confirm its own consistency remains unresolved. This continues to shape foundational debates in mathematical logic.
mathematics-logic
global-unspecified
whether
mathematical
its
own
any
system
haven
determined
possible
construct
resolved
philosophy-ethics
know
every
open
Global / Unspecified, Global
Many famous fractals are built from simple recursive rules, but whether every possible fractal pattern can always be reduced to such a finite description remains an open mathematical question. This connects geometry, computer science, and the study of natural patterns.
mathematics-logic
global-unspecified
whether
every
possible
fractal
pattern
finite
simple
rules
haven
determined
know
resolved
philosophy-ethics
mathematical
open
Global / Unspecified, Global
Discrete mathematics, dealing with countable structures, and continuous mathematics, dealing with smooth changes, sometimes resist clean translation between one another, and a fully unifying framework remains an unresolved and ambitious mathematical goal. This touches the deepest foundations of how mathematics is structured.
mathematics-logic
global-unspecified
mathematics
mathematical
framework
fully
discrete
continuous
haven
determined
whether
possible
philosophy-ethics
resolved
know
every
open
Global / Unspecified, Global
Specific techniques exist for counting solutions in many cases, but a complete and general method covering every possible polynomial system remains an unresolved goal in algebraic geometry. This continues to be an active area of mathematical research.
mathematics-logic
global-unspecified
possible
general
method
solutions
system
polynomial
haven
determined
whether
construct
philosophy-ethics
resolved
know
every
mathematical
open
Global / Unspecified, Global
Chaos theory has revealed hidden order within some seemingly random systems, but whether this holds true for every possible chaotic process remains an open and unresolved question. This connects mathematics with physics, biology, and the philosophy of determinism.
mathematics-logic
global-unspecified
whether
every
possible
process
chaotic
some
order
don
know
infinite
philosophy-ethics
resolved
haven
mathematical
open
Global / Unspecified, Global
Gödel's theorems confirm this for many well-known systems, but whether every conceivable finite proof system inevitably faces this limitation remains an unresolved logical question. This continues to shape foundational research into the nature of formal systems.
mathematics-logic
global-unspecified
whether
every
finite
proof
system
haven
determined
mathematical
must
eventually
philosophy-ethics
resolved
know
possible
open
Global / Unspecified, Global
Some sequences appear statistically uniform for extraordinarily long stretches before finally revealing subtle bias, and whether this always eventually happens remains an open question in number theory. This connects deeply to the study of pseudorandom number generation.
mathematics-logic
global-unspecified
whether
eventually
bias
haven
proven
every
possible
infinite
sequence
generated
know
resolved
philosophy-ethics
mathematical
open
Global / Unspecified, Global
Shape matching is solved efficiently for many specific cases, but a complete and efficient general method for every possible shape comparison remains an unresolved computational geometry question. This has real applications in computer vision and pattern recognition.
technology-computing
global-unspecified
whether
possible
general
efficient
method
don
know
construct
fully
determining
haven
philosophy-ethics
resolved
mathematics-logic
every
mathematical