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2. Indole-3-butyric acid - Wikipedia

   en.wikipedia.org/wiki/Indole-3-butyric_acid

   Indole-3-butyric acid (1H-indole-3-butanoic acid, IBA) is a white to light-yellow crystalline solid, with the molecular formula C 12 H 13 NO 2. It melts at 125°C in atmospheric pressure and decomposes before boiling. IBA is a plant hormone in the auxin family and is an ingredient in many commercial horticultural plant rooting products.

3. Degree of unsaturation - Wikipedia

   en.wikipedia.org/wiki/Degree_of_unsaturation

   For hydrocarbons, the DBE (or IHD) tells us the number of rings and/or extra bonds in a non-saturated structure, which equals the number of hydrogen pairs that are required to make the structure saturated, simply because joining two elements to form a ring or adding one extra bond (e.g., a single bond changed to a double bond) in a structure reduces the need for two H's.

4. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   The process for subtracting fractions is, in essence, the same as that of adding them: find a common denominator, and change each fraction to an equivalent fraction with the chosen common denominator. The resulting fraction will have that denominator, and its numerator will be the result of subtracting the numerators of the original fractions.

5. Irreducible fraction - Wikipedia

   en.wikipedia.org/wiki/Irreducible_fraction

   An equivalent definition is sometimes useful: if a and b are integers, then the fraction ⁠ a / b ⁠ is irreducible if and only if there is no other equal fraction ⁠ c / d ⁠ such that | c | < | a | or | d | < | b |, where | a | means the absolute value of a. [4] (Two fractions ⁠ a / b ⁠ and ⁠ c / d ⁠ are equal or equivalent if and ...

6. Egyptian fraction - Wikipedia

   en.wikipedia.org/wiki/Egyptian_fraction

   The Rhind Mathematical Papyrus. An Egyptian fraction is a finite sum of distinct unit fractions, such as + +. That is, each fraction in the expression has a numerator equal to 1 and a denominator that is a positive integer, and all the denominators differ from each other.

7. International Baccalaureate - Wikipedia

   en.wikipedia.org/wiki/International_Baccalaureate

   In 2006, government ministers in the United Kingdom provided funding so that "every local authority in England could have at least one centre offering sixth-formers the chance to do the IB." [ 43 ] In 2008, due to the devaluing of the A-Levels and an increase in the number of students taking the IB exams, then-Children's Secretary Ed Balls ...