่จปๅ†Šไธฆๅˆ†ไบซ้‚€่ซ‹้€ฃ็ต๏ผŒๅฏ็ฒๅพ—ๅฝฑ็‰‡ๆ’ญๆ”พ่ˆ‡้‚€่ซ‹็Žๅ‹ตใ€‚

Math Files
@Math_files
Life is nonlinear. So handle it using Math.
ๅŠ ๅ…ฅ June 2020
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The symbols ๐‘‘๐‘ฅ, ๐‘‘๐‘ฆ, and ๐‘‘๐‘ฅ/๐‘‘๐‘ฆ or ๐‘‘๐‘ฆ/๐‘‘๐‘ฅ were introduced by German mathematician Gottfried Wilhelm Leibniz (1646 โ€“ 1716) in a manuscript dated November 11, 1675 (Cajori Vol. 2, p. 204).
้กฏ็คบๆ›ดๅคš