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268 | Letter of Mr. Euler to Mr. de Lagrange |
317 | Clarifications on the movement of vibrating strings |
318 | Research into the motion of unequally thick strings |
319 | Research into the integration of the equation (ddz/dt2)=aa(ddz/dx2)+(b/x)(dz/dx) + (c/xx)z |
320 | Research into a new type of construction of six lens glasses and their improvement |
321 | Observations concerning the integrals of formulas ∫ xp-1dx(1-xn)q/n-1 setting x=1 after integration |