A Function Of A Variable Quantity Is

I Soon Found An Opportunity To Be Introduced To A Famous Professor Johann Bernoulli. ... True, He Was Very Busy And So Refused Flatly To Give Me Private Lessons; But He Gave Me Much More Valuable Advice To Start Reading More Difficult Mathematical Books On My Own And To Study Them As Diligently As I Could; If I Came Across Some Obstacle Or Difficulty, I Was Given Permission To Visit Him Freely Every Sunday Afternoon And He Kindly Explained To Me Everything I Could Not Understand.

Nothing Takes Place In The World Whose Meaning Is Not That Of Some Maximum Or Minimum.

Although To Penetrate Into The Intimate Mysteries Of Nature And Thence To Learn The True Causes Of Phenomena Is Not Allowed To Us, Nevertheless It Can Happen That A Certain Fictive Hypothesis May Suffice For Explaining Many Phenomena.

To Those Who Ask What The Infinitely Small Quantity In Mathematics Is, We Answer That It Is Actually Zero. Hence There Are Not So Many Mysteries Hidden In This Concept As They Are Usually Believed To Be.

Thus You See, Most Noble Sir, How This Type Of Solution To The Königsberg Bridge Problem Bears Little Relationship To Mathematics, And I Do Not Understand Why You Expect A Mathematician To Produce It, Rather Than Anyone Else, For The Solution Is Based On Reason Alone, And Its Discovery Does Not Depend On Any Mathematical Principle.