Statements in this class include the statement that P = NP, the Riemann hypothesis, and many other unsolved mathematical problems.

At this time, the apparent asymmetry of matter and antimatter in the visible universe is one of the greatest unsolved problems in physics.

Understanding this earliest of eras in the history of the Universe is currently one of the greatest unsolved problems in physics.

These are currently unsolved problems in physics.

However, there still were several unsolved problems, most notably the description of superconductivity and the Kondo effect.

* List of unsolved problems in chemistry

* List of unsolved problems in physics

Hilbert put forth a most influential list of 23 unsolved problems at the International Congress of Mathematicians in Paris in 1900.

These traditional problems often lay unsolved for centuries, and mathematicians gradually came to understand their depth ( in some cases ), rather than treat them as puzzles.

Crick was interested in two fundamental unsolved problems of biology: how molecules make the transition from the non-living to the living, and how the brain makes a conscious mind.

" And while the conjecture may one day be solved, the argument applies to similar unsolved problems ; to Brouwer, the law of the excluded middle was tantamount to assuming that every mathematical problem has a solution.

* List of unsolved problems in chemistry # Physical chemistry problems

This is one of the unsolved problems in physics.

In fact, Smale's list contains some of the original Hilbert problems, including the Riemann hypothesis and the second half of Hilbert's sixteenth problem, both of which are still unsolved.

While this expansion is well-modeled by the Big Bang theory, the origins of the singularity remains one of the unsolved problems in physics.

This is one of the unsolved problems in physics.

Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and in all of mathematics.

Most of the unsolved problems are related to the repartition in the plane of the Gaussian primes.

There are also conjectures and unsolved problems about the Gaussian primes.

The question of how superconductivity arises in high-temperature superconductors is one of the major unsolved problems of theoretical condensed matter physics.

In The Caves of Steel, the main power source is uranium nuclear stations, while solar space stations are stated to involve engineering problems which are still unsolved.

The problems were all unsolved at the time, and several of them were very influential for 20th century mathematics.

There are other problems ( notably the 5th ) for which experts have traditionally agreed on a single interpretation and a solution to the accepted interpretation has been given, but for which there remain unsolved problems which are so closely related as to be, perhaps, part of what Hilbert intended.

call it “ one of the deepest unsolved problems in graph theory .” Another result relating the four-color theorem to graph minors is the snark theorem announced by Robertson, Sanders, Seymour, and Thomas, a strengthening of the four-color theorem conjectured by W. T. Tutte and stating that any bridgeless 3-regular graph that requires four colors in an edge coloring must have the Petersen graph as a minor.

In the ' Thunder Gun Express ' episode of It's Always Sunny in Philadelphia, Frank Reynolds, played by Danny DeVito steals a tourist ferry and travels down the Schuylkill River, noting that it's " the depository of all the unsolved crimes and murders in Philadelphia "

If, due to unsolved words, the round extends beyond the normal maximum of five words, sixth and subsequent words are played on a new board.

However, the time hierarchy theorems provide no means to relate deterministic and non-deterministic complexity, or time and space complexity, so they cast no light on the great unsolved questions of computational complexity theory: whether P and NP, NP and PSPACE, PSPACE and EXPTIME, or EXPTIME and NEXPTIME are equal or not.

The explanation of consciousness is one of the great unsolved mysteries in science.

He concludes that " there is actually no wholly satisfactory explanation for the Aurora Islands and they remain one of the great unsolved mysteries of the sea ".

" The strangeness, the daring, the seeming impenetrability of the crime marked it as one of the most singular and astonishing cases in New York's police annals ; and had it not been for Philo Vance's participation in its solution, I firmly believe it would have remained one of the great unsolved mysteries of this country.

It was considered a great unsolved problem by the climbing community in the 1920s and 1930s.

A great deal is already known about these domains, but there remain some fascinating, unsolved problems.

Nestorius tried to answer a question considered unsolved: " How can Jesus Christ, being part man, not be partially a sinner as well, since man is by definition a sinner since the Fall ".

Perfect crime is a colloquial term used in law and fiction ( principally crime fiction ) to characterize crimes that are undetected, unattributed to a perpetrator, or else unsolved as a kind of technical achievement on the part of the perpetrator.

Both problems are part of a series-OGR is part of an infinite series ; RC5 currently has eight unsolved challenges from RSA Security, although in May 2007, RSA Security announced that they would no longer be providing prize money for a correct key to any of their secret key challenges.

In 1900 David Hilbert included it in his list of twenty three unsolved problems of mathematics — it forms part of Hilbert's eighteenth problem.

The first part of the problem is yet unsolved for n = 8.

In June 2012, members of the Metropolitan Police visited Libya as part of the investigation into the unsolved killing.

The grave may be sought as part of an investigation of an unsolved crime or may in some rare cases result from information gained from an individual already convicted of the crime in the absence of a grave.

* solved and unsolved homicides, especially those involving a kidnapping or if they are apparently motiveless, sexual or random or suspected to be part of a series

However, with the imminent death of the childless Charles II of Spain a new conflict over the inheritance of the Spanish Empire ( the most important unsolved question of European politics ) would soon embroil France and the Grand Alliance in Louis XIV's final conflict – the War of the Spanish Succession.

However, the question of the Spanish inheritance was not discussed at Ryswick, and it remained the most important unsolved question of European politics.

From the end of the nineteenth century, Serbian politics was constantly plagued by unsolved national problems, key amongst them the large number of Serbs living outside the Serbian national state.