You can spell the possessive form "Eratosthenes's" if you wish, but it makes for a rather clumsy sound. It is quite common, in British English anyway, to omit the 's' following the apostrophe after a name or other noun that ends in 's', for reasons of euphony.
The two accepted forms for possessive singular nouns ending in s are:
Add an apostrophe (') after the existing s at the end of the word: Eratosthenes'
Add an apostrophe s ('s) after the existing s at the end of the word: Eratosthenes's
Examples:
Eratosthenes' life was devoted to science.
Eratosthenes's life was devoted to science.
Note: The -s's is the most commonly used form, but if you are a student, use the form that is preferred by your teacher.
"Seconds". This case involves a simple plural (no possessive, no acronyms, etc.), and so no apostrophes are involved. That applies to any plural - there should never be an apostrophe before the "s" in simple plurals.
The Sieve of Eratosthenes filters numbers, letting the composites fall through while the primes remain.
Eratosthenes
"Be kind, O Bacchus, take this empty pot offered to thee by Xenophon, the sot, Who, giving this, gives all that he has got" -Eratosthenes
THE EARLIEST KNOWN MEASUREMENTS WERE CALCULATED IN 200 BCE THE GREEK PHILOSOPHER ERATOSTHENES ACCORDING TO HIS CALCULATIONS THE CIRCUMFERENCE OF the earthWAS 39,600 KM....
The possessive form of Arkansas is commonly spelled Arkansas'. Arkansas is pronounced like Arkansaw but in the possessive form it is pronounced like it is spelled, with an 's' on the end.
The possessive pronouns are: mine, yours, his, hers, and its. The possessive adjectives are: my, your, his, her, and its. There is no single thing that a possessive pronoun (or a possessive adjective) always has. It is either spelled and used correctly or it is not.
The possessive for a single country is country's (e.g. a country's borders).
There are two accepted forms for possessive singular nouns ending in s:Add an apostrophe (') after the existing s at the end of the word: Weis'Add an apostrophe s ('s) after the existing s at the end of the word: Weis'sExamples:Mr. Weis' classroom is number twenty six.Mr. Weis's classroom is number twenty six.
The possessive form for the noun man is man's.example: It is a man's right to be happy.
The pronounciation of Eratosthenes is : ai r - uh - T AW S - th uh - n ee z
Create the possessive form of an abbreviation in the same manner as you would for a word or term that was spelled out completely. Add 's for the singular possessive or an apostrophe only for the plural possessive.the IRS's district officesAT&T's 1-800-telephone numberNBC's newscastIBM Corp.'s district sales office
The possessive form for the proper noun Zeus is Zeus's.
The plural possessive noun is neighbors'. You have spelled it correctly.
Because "Boys' " is a plural possessive. "Boy" become plural with the addition of the "-S" and "Boys" becomes possessive with the apostrophe.
As it is spelled, it the plural possessive form. the singular form is toy; the plural form is toys. The singular possessive form is toy's (as in "the toy's wheels are falling off). The plural possessive form is as you spelled it - toys'. As in "All the toys' wheels and axles are falling off.
There are two accepted forms for possessive singularnouns that end with an s:Add an apostrophe (') after the existing s at the end of the word:Harris'Add an apostrophe s ('s) after the existing s at the end of the word:Harris'sExamples:Mr. Harris' office is on the second floor.Mr. Harris's office is on the second floor.The plural form of the proper noun Harris is Harrises.The plural possessive form is Harrises'.Example: The Harrises' children are twins.