In this scenario, a $1 rise in the stock price to $61 will push the delta up 0.05 point, or 5 percentage points, to 80%. For the option buyer, gamma is always positive on both calls and puts.

Mercury News Letters to the Editor for June 29, 2023 ...

Delta’s decline began long ago "Delta's decline began long ago" (Letters, Dec. 27): I arrived in Sacramento 65 years ago, a young civil engineer a few years out of college.

Sunday Times News: The Greek alphabet, which has been in use since about 9 B.C., was the first to have letters for each vowel and consonant.

People infected with the delta variant have been reported to have viral loads 1,000 times higher than other variants. This contributed to the CDC changing its guidance on masks for vaccinated people.